message: fix check_timer bugs.
diff: @@ -35,7 +35,7 @@ typedef struct _swTimer_callback
  int type;
  } swTimer_callback;
  -static swHashMap *timer_map;
  +static swHashMap *timer_map = NULL;
  static void php_swoole_onTimeout(swTimer *timer, swTimer_node *tnode);
  static void php_swoole_onInterval(swTimer *timer, swTimer_node *tnode);
  @@ -236,6 +236,9 @@ void php_swoole_check_timer(int msec)
  if (SwooleG.timer.fd == 0)
  {
  swTimer_init(msec);
  + }
  + if (timer_map == NULL)
  + {
  timer_map = swHashMap_new(SW_HASHMAP_INIT_BUCKET_N, NULL);
  }
  }
  