message: Fix memory read error in socket error event callback.
diff: @@ -78,7 +78,8 @@ int Socket::error_event_callback(swReactor *reactor, swEvent *event)
  socket->set_err(0);
  socket->write_co->resume();
  }
  - if (socket->read_co)
  + // Notice: socket maybe deleted in write coroutine
  + if (!event->socket->removed && socket->read_co)
  {
  socket->set_err(0);
  socket->read_co->resume();
  