message: fix invalid return type [2]
diff: @@ -458,7 +458,7 @@ bool System::socket_poll(std::unordered_map<int, socket_poll_fd> &fds, double ti
  if (!event_list)
  {
  swWarn("malloc[1] failed");
  - return SW_ERR;
  + return false;
  }
  int j = 0;
  for (auto i = fds.begin(); i != fds.end(); i++)
  