message: Clear the COROG before program run out of the coroutine.
diff: @@ -444,6 +444,8 @@ void sw_coro_close()
  free_cidmap(task->cid);
  efree(task->stack);
  --COROG.coro_num;
  + COROG.current_coro = NULL;
  + COROG.require = 0;
  swTraceLog(SW_TRACE_COROUTINE, "close coro and %d remained. usage size: %zu. malloc size: %zu", COROG.coro_num, zend_memory_usage(0), zend_memory_usage(1));
  }
  