Update interleaved_frame.go

Author: kevmo314

pkg/base/interleaved_frame.go

@@ -39,7 +39,7 @@ func (f *InterleavedFrame) Unmarshal(br *bufio.Reader) error {
 	f.Channel = int(header[1])
 	if cap(f.Payload) < payloadLen {
 		// if there's not enough space, extend the buffer
-		f.Payload = append(f.Payload[:cap(f.Payload)], make([]byte, payloadLen-len(f.Payload))...)
+		f.Payload = append(f.Payload[:cap(f.Payload)], make([]byte, payloadLen-cap(f.Payload))...)
 	} else {
 		// otherwise, set the len of the buffer to the payloadLen
 		f.Payload = f.Payload[:payloadLen]