message: Fixes potential build warnings with macro
diff: @@ -102,6 +102,7 @@ void IAP2USBEmulationTransportAdapter::DeviceSwitched(
  const auto bytes =
  write(out_, switch_signal_ack.c_str(), switch_signal_ack.size());
  + UNUSED(bytes);
  LOG4CXX_DEBUG(logger_, "Written bytes to out: " << bytes);
  LOG4CXX_DEBUG(logger_, "Switching signal ACK is sent");
  @@ -131,6 +132,7 @@ void IAP2USBEmulationTransportAdapter::IAPSignalHandlerDelegate::threadMain() {
  const auto size = 32;
  while (run_flag_) {
  char buffer[size];
  + // TODO: maybe need to check errno
  auto bytes = read(in_, &buffer, size);
  if (!bytes) {
  continue;
  