message: fix can_exit
diff: @@ -138,9 +138,9 @@ int swReactor_empty(swReactor *reactor)
  empty = SW_TRUE;
  }
  //coroutine
  - if (empty && reactor->can_exit && reactor->can_exit(reactor))
  + if (reactor->can_exit && !reactor->can_exit(reactor))
  {
  - empty = SW_TRUE;
  + empty = SW_FALSE;
  }
  return empty;
  }
  