message: remove kill 0 pid log
diff: @@ -64,7 +64,6 @@ static void swManager_kill_timeout_process(swTimer *timer, swTimer_node *tnode)
  pid_t pid = workers[i].pid;
  if (swKill(pid, 0) == -1)
  {
  - swSysError("swKill(%d, 0) [%d] failed.", pid, i);
  continue;
  }
  if (swKill(pid, SIGKILL) < 0)
  