message: Fix the tx/rx update in ProxyStream
diff: @@ -368,7 +368,7 @@ impl AsyncRead for ProxyStream {
  {
  if self.is_proxied() {
  if let Poll::Ready(Ok(n)) = p {
  - self.context().local_flow_statistic().tcp().incr_tx(n as u64);
  + self.context().local_flow_statistic().tcp().incr_rx(n as u64);
  }
  }
  }
  @@ -386,7 +386,7 @@ impl AsyncWrite for ProxyStream {
  {
  if self.is_proxied() {
  if let Poll::Ready(Ok(n)) = p {
  - self.context().local_flow_statistic().tcp().incr_rx(n as u64);
  + self.context().local_flow_statistic().tcp().incr_tx(n as u64);
  }
  }
  }
  