all: use rlp.DecodeBytes instead of rlp.Decode where possible (#27994)

p2p/discover/v4wire/v4wire.go

@@ -238,6 +238,8 @@ func Decode(input []byte) (Packet, Pubkey, []byte, error) {
 	default:
 		return nil, fromKey, hash, fmt.Errorf("unknown type: %d", ptype)
 	}
+	// Here we use NewStream to allow for additional data after the first
+	// RLP object (forward-compatibility).
 	s := rlp.NewStream(bytes.NewReader(sigdata[1:]), 0)
 	err = s.Decode(req)
 	return req, fromKey, hash, err