lnd: fix unconvert warnings

lnwire/lnwire.go

@@ -62,13 +62,13 @@ func writeElement(w io.Writer, element interface{}) error {
 	switch e := element.(type) {
 	case uint8:
 		var b [1]byte
-		b[0] = byte(e)
+		b[0] = e
 		if _, err := w.Write(b[:]); err != nil {
 			return err
 		}
 	case uint16:
 		var b [2]byte
-		binary.BigEndian.PutUint16(b[:], uint16(e))
+		binary.BigEndian.PutUint16(b[:], e)
 		if _, err := w.Write(b[:]); err != nil {
 			return err
 		}
@@ -86,13 +86,13 @@ func writeElement(w io.Writer, element interface{}) error {
 		}
 	case uint32:
 		var b [4]byte
-		binary.BigEndian.PutUint32(b[:], uint32(e))
+		binary.BigEndian.PutUint32(b[:], e)
 		if _, err := w.Write(b[:]); err != nil {
 			return err
 		}
 	case uint64:
 		var b [8]byte
-		binary.BigEndian.PutUint64(b[:], uint64(e))
+		binary.BigEndian.PutUint64(b[:], e)
 		if _, err := w.Write(b[:]); err != nil {
 			return err
 		}

lnwire/signature.go

@@ -19,8 +19,8 @@ func serializeSigToWire(b *[64]byte, e *btcec.Signature) error {
 	// is the second byte after R ends. 0x02 signifies a length-prefixed,
 	// zero-padded, big-endian bigint. 0x30 sigifies a DER signature.
 	// See the Serialize() method for btcec.Signature for details.
-	rLen := uint8(sig[3])
-	sLen := uint8(sig[5+rLen])
+	rLen := sig[3]
+	sLen := sig[5+rLen]
 
 	// Check to make sure R and S can both fit into their intended buffers.
 	// We check S first because these code blocks decrement sLen and