lnd: fix gosimple warnings

brontide/noise.go

@@ -443,11 +443,8 @@ func (b *BrontideMachine) RecvActOne(actOne [ActOneSize]byte) error {
 
 	// If the initiator doesn't know our static key, then this operation
 	// will fail.
-	if _, err := b.DecryptAndHash(p[:]); err != nil {
-		return err
-	}
-
-	return nil
+	_, err = b.DecryptAndHash(p[:])
+	return err
 }
 
 // GenActTwo generates the second packet (act two) to be sent from the
@@ -515,11 +512,8 @@ func (b *BrontideMachine) RecvActTwo(actTwo [ActTwoSize]byte) error {
 	s := ecdh(b.remoteEphemeral, b.localEphemeral)
 	b.mixKey(s)
 
-	if _, err := b.DecryptAndHash(p[:]); err != nil {
-		return err
-	}
-
-	return nil
+	_, err = b.DecryptAndHash(p[:])
+	return err
 }
 
 // GenActThree creates the final (act three) packet of the handshake. Act three
@@ -662,11 +656,8 @@ func (b *BrontideMachine) WriteMessage(w io.Writer, p []byte) error {
 	// single packet, as any fragmentation should have taken place at a
 	// higher level.
 	cipherText := b.sendCipher.Encrypt(nil, nil, p)
-	if _, err := w.Write(cipherText); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := w.Write(cipherText)
+	return err
 }
 
 // ReadMessage attempts to read the next message from the passed io.Reader. In

channeldb/channel.go

@@ -1269,11 +1269,7 @@ func fetchChannelIDs(nodeChanBucket *bolt.Bucket, channel *OpenChannel) error {
 
 	idBytes := nodeChanBucket.Get(idKey)
 	channel.IdentityPub, err = btcec.ParsePubKey(idBytes, btcec.S256())
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return err
 }
 
 func putChanCommitKeys(nodeChanBucket *bolt.Bucket, channel *OpenChannel) error {
@@ -1329,11 +1325,7 @@ func fetchChanCommitKeys(nodeChanBucket *bolt.Bucket, channel *OpenChannel) erro
 	}
 
 	channel.OurCommitKey, err = btcec.ParsePubKey(keyBytes[33:], btcec.S256())
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return err
 }
 
 func putChanCommitTxns(nodeChanBucket *bolt.Bucket, channel *OpenChannel) error {
@@ -1631,11 +1623,7 @@ func fetchChanPreimageState(nodeChanBucket *bolt.Bucket, channel *OpenChannel) e
 	}
 
 	_, err = io.ReadFull(reader, channel.StateHintObsfucator[:])
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return err
 }
 
 func putChanDeliveryScripts(nodeChanBucket *bolt.Bucket, channel *OpenChannel) error {
@@ -1683,11 +1671,7 @@ func fetchChanDeliveryScripts(nodeChanBucket *bolt.Bucket, channel *OpenChannel)
 	}
 
 	channel.TheirDeliveryScript, err = wire.ReadVarBytes(deliveryBytes, 0, 520, "")
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return err
 }
 
 // htlcDiskSize represents the number of btyes a serialized HTLC takes up on
@@ -1717,11 +1701,8 @@ func serializeHTLC(w io.Writer, h *HTLC) error {
 	byteOrder.PutUint16(buf[n:], h.OutputIndex)
 	n += 2
 
-	if _, err := w.Write(buf[:]); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := w.Write(buf[:])
+	return err
 }
 
 func deserializeHTLC(r io.Reader) (*HTLC, error) {
@@ -1980,11 +1961,8 @@ func writeOutpoint(w io.Writer, o *wire.OutPoint) error {
 	}
 
 	byteOrder.PutUint32(scratch, o.Index)
-	if _, err := w.Write(scratch); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := w.Write(scratch)
+	return err
 }
 
 func readOutpoint(r io.Reader, o *wire.OutPoint) error {

channeldb/db.go

@@ -437,11 +437,7 @@ func (d *DB) syncVersions(versions []version) error {
 		}
 
 		meta.DbVersionNumber = latestVersion
-		if err := putMeta(meta, tx); err != nil {
-			return err
-		}
-
-		return nil
+		return putMeta(meta, tx)
 	})
 }
 

channeldb/meta.go

@@ -76,8 +76,5 @@ func putMeta(meta *Meta, tx *bolt.Tx) error {
 func putDbVersion(metaBucket *bolt.Bucket, meta *Meta) error {
 	scratch := make([]byte, 4)
 	byteOrder.PutUint32(scratch, meta.DbVersionNumber)
-	if err := metaBucket.Put(dbVersionKey, scratch); err != nil {
-		return err
-	}
-	return nil
+	return metaBucket.Put(dbVersionKey, scratch)
 }

channeldb/nodes.go

@@ -158,11 +158,7 @@ func (db *DB) FetchLinkNode(identity *btcec.PublicKey) (*LinkNode, error) {
 		// returned to the caller.
 		nodeReader := bytes.NewReader(nodeBytes)
 		node, err = deserializeLinkNode(nodeReader)
-		if err != nil {
-			return err
-		}
-
-		return nil
+		return err
 	})
 	if err != nil {
 		return nil, err

channeldb/payments.go

@@ -127,11 +127,7 @@ func (db *DB) DeleteAllPayments() error {
 		}
 
 		_, err = tx.CreateBucket(paymentBucket)
-		if err != nil {
-			return err
-		}
-
-		return nil
+		return err
 	})
 }
 

invoiceregistry.go

@@ -88,14 +88,10 @@ func (i *invoiceRegistry) AddInvoice(invoice *channeldb.Invoice) error {
 	}))
 
 	// TODO(roasbeef): also check in memory for quick lookups/settles?
-	if err := i.cdb.AddInvoice(invoice); err != nil {
-		return err
-	}
+	return i.cdb.AddInvoice(invoice)
 
 	// TODO(roasbeef): re-enable?
 	//go i.notifyClients(invoice, false)
-
-	return nil
 }
 
 // lookupInvoice looks up an invoice by its payment hash (R-Hash), if found

lnwallet/btcwallet/btcwallet.go

@@ -281,11 +281,7 @@ func (b *BtcWallet) FetchRootKey() (*btcec.PrivateKey, error) {
 			rootBucket := tx.RootBucket()
 
 			rootAddrHash = rootAddr[0].Address().ScriptAddress()
-			if err := rootBucket.Put(rootKey, rootAddrHash); err != nil {
-				return err
-			}
-
-			return nil
+			return rootBucket.Put(rootKey, rootAddrHash)
 		}); err != nil {
 			return nil, err
 		}

lnwallet/interface_test.go

@@ -311,17 +311,14 @@ func loadTestCredits(miner *rpctest.Harness, w *lnwallet.LightningWallet, numOut
 	// Wait until the wallet has finished syncing up to the main chain.
 	ticker := time.NewTicker(100 * time.Millisecond)
 	expectedBalance := btcutil.Amount(satoshiPerOutput * int64(numOutputs))
-out:
-	for {
-		select {
-		case <-ticker.C:
-			balance, err := w.ConfirmedBalance(1, false)
-			if err != nil {
-				return err
-			}
-			if balance == expectedBalance {
-				break out
-			}
+
+	for range ticker.C {
+		balance, err := w.ConfirmedBalance(1, false)
+		if err != nil {
+			return err
+		}
+		if balance == expectedBalance {
+			break
 		}
 	}
 	ticker.Stop()

lnwire/channel_announcement.go

@@ -56,7 +56,7 @@ func (a *ChannelAnnouncement) Validate() error {
 //
 // This is part of the lnwire.Message interface.
 func (c *ChannelAnnouncement) Decode(r io.Reader, pver uint32) error {
-	err := readElements(r,
+	return readElements(r,
 		&c.FirstNodeSig,
 		&c.SecondNodeSig,
 		&c.ChannelID,
@@ -67,11 +67,6 @@ func (c *ChannelAnnouncement) Decode(r io.Reader, pver uint32) error {
 		&c.FirstBitcoinKey,
 		&c.SecondBitcoinKey,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target ChannelAnnouncement into the passed io.Writer
@@ -79,7 +74,7 @@ func (c *ChannelAnnouncement) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *ChannelAnnouncement) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.FirstNodeSig,
 		c.SecondNodeSig,
 		c.ChannelID,
@@ -90,11 +85,6 @@ func (c *ChannelAnnouncement) Encode(w io.Writer, pver uint32) error {
 		c.FirstBitcoinKey,
 		c.SecondBitcoinKey,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/channel_update_announcement.go

@@ -72,7 +72,7 @@ func (a *ChannelUpdateAnnouncement) Validate() error {
 //
 // This is part of the lnwire.Message interface.
 func (c *ChannelUpdateAnnouncement) Decode(r io.Reader, pver uint32) error {
-	err := readElements(r,
+	return readElements(r,
 		&c.Signature,
 		&c.ChannelID,
 		&c.Timestamp,
@@ -82,11 +82,6 @@ func (c *ChannelUpdateAnnouncement) Decode(r io.Reader, pver uint32) error {
 		&c.FeeBaseMsat,
 		&c.FeeProportionalMillionths,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target ChannelUpdateAnnouncement into the passed
@@ -94,7 +89,7 @@ func (c *ChannelUpdateAnnouncement) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *ChannelUpdateAnnouncement) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.Signature,
 		c.ChannelID,
 		c.Timestamp,
@@ -104,11 +99,6 @@ func (c *ChannelUpdateAnnouncement) Encode(w io.Writer, pver uint32) error {
 		c.FeeBaseMsat,
 		c.FeeProportionalMillionths,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/close_complete.go

@@ -43,14 +43,9 @@ var _ Message = (*CloseComplete)(nil)
 func (c *CloseComplete) Decode(r io.Reader, pver uint32) error {
 	// ChannelPoint (8)
 	// ResponderCloseSig (73)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.ResponderCloseSig)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target CloseComplete into the passed io.Writer observing
@@ -60,14 +55,9 @@ func (c *CloseComplete) Decode(r io.Reader, pver uint32) error {
 func (c *CloseComplete) Encode(w io.Writer, pver uint32) error {
 	// ChannelPoint (8)
 	// ResponderCloseSig (73)
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.ResponderCloseSig)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/close_request.go

@@ -57,15 +57,10 @@ func (c *CloseRequest) Decode(r io.Reader, pver uint32) error {
 	// RequesterCloseSig (73)
 	// 	First byte length then sig
 	// Fee (8)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.RequesterCloseSig,
 		&c.Fee)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target CloseRequest into the passed io.Writer observing
@@ -76,15 +71,10 @@ func (c *CloseRequest) Encode(w io.Writer, pver uint32) error {
 	// ChannelID
 	// RequesterCloseSig
 	// Fee
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.RequesterCloseSig,
 		c.Fee)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/commit_sig.go

@@ -46,15 +46,10 @@ var _ Message = (*CommitSig)(nil)
 func (c *CommitSig) Decode(r io.Reader, pver uint32) error {
 	// ChannelPoint(8)
 	// RequesterCommitSig(73max+2)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.CommitSig,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target CommitSig into the passed io.Writer
@@ -62,14 +57,10 @@ func (c *CommitSig) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *CommitSig) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.CommitSig,
 	)
-	if err != nil {
-		return err
-	}
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/error_generic.go

@@ -73,17 +73,12 @@ var _ Message = (*ErrorGeneric)(nil)
 func (c *ErrorGeneric) Decode(r io.Reader, pver uint32) error {
 	// ChannelPoint(8)
 	// Problem
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.Code,
 		&c.Problem,
 		&c.PendingChannelID,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target ErrorGeneric into the passed io.Writer
@@ -91,17 +86,12 @@ func (c *ErrorGeneric) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *ErrorGeneric) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.Code,
 		c.Problem,
 		c.PendingChannelID,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying an ErrorGeneric message on

lnwire/features.go

@@ -197,11 +197,8 @@ func (f *FeatureVector) Encode(w io.Writer) error {
 		setFlag(data, position, flag)
 	}
 
-	if _, err := w.Write(data); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := w.Write(data)
+	return err
 }
 
 // Compare checks that features are compatible and returns the features which

lnwire/init_message.go

@@ -1,8 +1,8 @@
 package lnwire
 
 import (
-	"io"
 	"github.com/go-errors/errors"
+	"io"
 )
 
 // Init is the first message reveals the features supported or required by this
@@ -34,15 +34,10 @@ func NewInitMessage(gf, lf *FeatureVector) *Init {
 func (msg *Init) Decode(r io.Reader, pver uint32) error {
 	// LocalFeatures(~)
 	// GlobalFeatures(~)
-	err := readElements(r,
+	return readElements(r,
 		&msg.LocalFeatures,
 		&msg.GlobalFeatures,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // A compile time check to ensure Init implements the lnwire.Message
@@ -54,15 +49,10 @@ var _ Message = (*Init)(nil)
 //
 // This is part of the lnwire.Message interface.
 func (msg *Init) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		msg.LocalFeatures,
 		msg.GlobalFeatures,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/message.go

@@ -244,11 +244,7 @@ func WriteMessage(w io.Writer, msg Message, pver uint32, btcnet wire.BitcoinNet)
 	// Write payload the payload itself after the header.
 	n, err = w.Write(payload)
 	totalBytes += n
-	if err != nil {
-		return totalBytes, err
-	}
-
-	return totalBytes, nil
+	return totalBytes, err
 }
 
 // ReadMessageN reads, validates, and parses the next bitcoin Message from r for

lnwire/node_announcement.go

@@ -128,7 +128,7 @@ func (a *NodeAnnouncement) Validate() error {
 //
 // This is part of the lnwire.Message interface.
 func (c *NodeAnnouncement) Decode(r io.Reader, pver uint32) error {
-	err := readElements(r,
+	return readElements(r,
 		&c.Signature,
 		&c.Timestamp,
 		&c.Address,
@@ -137,11 +137,6 @@ func (c *NodeAnnouncement) Decode(r io.Reader, pver uint32) error {
 		&c.pad,
 		&c.Alias,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target NodeAnnouncement into the passed io.Writer
@@ -149,7 +144,7 @@ func (c *NodeAnnouncement) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *NodeAnnouncement) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.Signature,
 		c.Timestamp,
 		c.Address,
@@ -158,11 +153,6 @@ func (c *NodeAnnouncement) Encode(w io.Writer, pver uint32) error {
 		c.pad,
 		c.Alias,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/ping.go

@@ -27,14 +27,9 @@ var _ Message = (*Pong)(nil)
 //
 // This is part of the lnwire.Message interface.
 func (p *Pong) Decode(r io.Reader, pver uint32) error {
-	err := readElements(r,
+	return readElements(r,
 		&p.Nonce,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target Pong into the passed io.Writer observing the
@@ -42,14 +37,9 @@ func (p *Pong) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (p *Pong) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		p.Nonce,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/pong.go

@@ -26,14 +26,9 @@ var _ Message = (*Ping)(nil)
 //
 // This is part of the lnwire.Message interface.
 func (p *Ping) Decode(r io.Reader, pver uint32) error {
-	err := readElements(r,
+	return readElements(r,
 		&p.Nonce,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target Ping into the passed io.Writer observing the
@@ -41,14 +36,9 @@ func (p *Ping) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (p *Ping) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		p.Nonce,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/revoke_and_ack.go

@@ -62,17 +62,12 @@ func (c *RevokeAndAck) Decode(r io.Reader, pver uint32) error {
 	// Revocation (32)
 	// NextRevocationKey (33)
 	// NextRevocationHash (32)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		c.Revocation[:],
 		&c.NextRevocationKey,
 		c.NextRevocationHash[:],
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target RevokeAndAck into the passed io.Writer
@@ -80,17 +75,12 @@ func (c *RevokeAndAck) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *RevokeAndAck) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.Revocation[:],
 		c.NextRevocationKey,
 		c.NextRevocationHash[:],
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/single_funding_complete.go

@@ -69,17 +69,12 @@ func (s *SingleFundingComplete) Decode(r io.Reader, pver uint32) error {
 	// FundingOutPoint (36)
 	// CommitmentSignature (73)
 	// RevocationKey (33)
-	err := readElements(r,
+	return readElements(r,
 		&s.ChannelID,
 		&s.FundingOutPoint,
 		&s.CommitSignature,
 		&s.RevocationKey,
 		s.StateHintObsfucator[:])
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target SingleFundingComplete into the passed io.Writer
@@ -92,17 +87,12 @@ func (s *SingleFundingComplete) Encode(w io.Writer, pver uint32) error {
 	// FundingOutPoint (36)
 	// Commitment Signature (73)
 	// RevocationKey (33)
-	err := writeElements(w,
+	return writeElements(w,
 		s.ChannelID,
 		s.FundingOutPoint,
 		s.CommitSignature,
 		s.RevocationKey,
 		s.StateHintObsfucator[:])
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the uint32 code which uniquely identifies this message as a

lnwire/single_funding_signcomplete.go

@@ -40,14 +40,9 @@ func NewSingleFundingSignComplete(chanID uint64,
 func (c *SingleFundingSignComplete) Decode(r io.Reader, pver uint32) error {
 	// ChannelID (8)
 	// CommitmentSignature (73)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelID,
 		&c.CommitSignature)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target SingleFundingSignComplete into the passed
@@ -56,14 +51,9 @@ func (c *SingleFundingSignComplete) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *SingleFundingSignComplete) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelID,
 		c.CommitSignature)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the uint32 code which uniquely identifies this message as a

lnwire/update_add_htlc.go

@@ -76,7 +76,7 @@ func (c *UpdateAddHTLC) Decode(r io.Reader, pver uint32) error {
 	// Amount(8)
 	// PaymentHash(32)
 	// OnionBlob(1254)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.ID,
 		&c.Expiry,
@@ -84,11 +84,6 @@ func (c *UpdateAddHTLC) Decode(r io.Reader, pver uint32) error {
 		c.PaymentHash[:],
 		c.OnionBlob[:],
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target UpdateAddHTLC into the passed io.Writer observing
@@ -96,7 +91,7 @@ func (c *UpdateAddHTLC) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *UpdateAddHTLC) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.ID,
 		c.Expiry,
@@ -104,11 +99,6 @@ func (c *UpdateAddHTLC) Encode(w io.Writer, pver uint32) error {
 		c.PaymentHash[:],
 		c.OnionBlob[:],
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/update_fail_htlc.go

@@ -108,16 +108,11 @@ func (c *UpdateFailHTLC) Decode(r io.Reader, pver uint32) error {
 	// ChannelPoint(8)
 	// HTLCKey(8)
 	// Reason(??)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.ID,
 		&c.Reason,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target UpdateFailHTLC into the passed io.Writer observing
@@ -125,16 +120,11 @@ func (c *UpdateFailHTLC) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *UpdateFailHTLC) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.ID,
 		c.Reason,
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

lnwire/update_fulfill_htlc.go

@@ -48,16 +48,11 @@ func (c *UpdateFufillHTLC) Decode(r io.Reader, pver uint32) error {
 	// ChannelPoint(8)
 	// ID(8)
 	// PaymentPreimage(32)
-	err := readElements(r,
+	return readElements(r,
 		&c.ChannelPoint,
 		&c.ID,
 		c.PaymentPreimage[:],
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Encode serializes the target UpdateFufillHTLC into the passed io.Writer
@@ -65,16 +60,11 @@ func (c *UpdateFufillHTLC) Decode(r io.Reader, pver uint32) error {
 //
 // This is part of the lnwire.Message interface.
 func (c *UpdateFufillHTLC) Encode(w io.Writer, pver uint32) error {
-	err := writeElements(w,
+	return writeElements(w,
 		c.ChannelPoint,
 		c.ID,
 		c.PaymentPreimage[:],
 	)
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // Command returns the integer uniquely identifying this message type on the

networktest.go

@@ -541,11 +541,8 @@ func (n *networkHarness) ConnectNodes(ctx context.Context, a, b *lightningNode)
 			Host:   b.p2pAddr,
 		},
 	}
-	if _, err := a.ConnectPeer(ctx, req); err != nil {
-		return err
-	}
-
-	return nil
+	_, err = a.ConnectPeer(ctx, req)
+	return err
 }
 
 // RestartNode  attempts to restart a lightning node by shutting it down

utxonursery.go

@@ -668,7 +668,7 @@ func createSweepTx(wallet *lnwallet.LightningWallet,
 // chain reorganization occurs. This is the final step in the output incubation
 // process.
 func deleteGraduatedOutputs(db *channeldb.DB, deleteHeight uint32) error {
-	err := db.Update(func(tx *bolt.Tx) error {
+	return db.Update(func(tx *bolt.Tx) error {
 		kgtnBucket := tx.Bucket(kindergartenBucket)
 		if kgtnBucket == nil {
 			return nil
@@ -695,18 +695,13 @@ func deleteGraduatedOutputs(db *channeldb.DB, deleteHeight uint32) error {
 
 		return nil
 	})
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // putLastHeightGraduated persists the most recently processed blockheight
 // to the database. This blockheight is used during restarts to determine if
 // blocks were missed while the UTXO Nursery was offline.
 func putLastHeightGraduated(db *channeldb.DB, blockheight uint32) error {
-	err := db.Update(func(tx *bolt.Tx) error {
+	return db.Update(func(tx *bolt.Tx) error {
 		kgtnBucket, err := tx.CreateBucketIfNotExists(kindergartenBucket)
 		if err != nil {
 			return nil
@@ -714,17 +709,8 @@ func putLastHeightGraduated(db *channeldb.DB, blockheight uint32) error {
 
 		heightBytes := make([]byte, 4)
 		byteOrder.PutUint32(heightBytes, blockheight)
-		if err := kgtnBucket.Put(lastGraduatedHeightKey, heightBytes); err != nil {
-			return err
-		}
-
-		return nil
+		return kgtnBucket.Put(lastGraduatedHeightKey, heightBytes)
 	})
-	if err != nil {
-		return err
-	}
-
-	return nil
 }
 
 // newSweepPkScript creates a new public key script which should be used to
@@ -808,11 +794,8 @@ func serializeKidOutput(w io.Writer, kid *kidOutput) error {
 	}
 
 	byteOrder.PutUint32(scratch[:4], uint32(kid.signDescriptor.HashType))
-	if _, err := w.Write(scratch[:4]); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := w.Write(scratch[:4])
+	return err
 }
 
 // deserializeKidOutput takes a byte array representation of a kidOutput
@@ -899,11 +882,8 @@ func writeOutpoint(w io.Writer, o *wire.OutPoint) error {
 	}
 
 	byteOrder.PutUint32(scratch, o.Index)
-	if _, err := w.Write(scratch); err != nil {
-		return err
-	}
-
-	return nil
+	_, err := w.Write(scratch)
+	return err
 }
 
 // TODO(bvu): copied from channeldb, remove repetition