message: fix bad operator
diff: @@ -2885,7 +2885,7 @@ PHP_METHOD(swoole_server, stats)
  }
  #ifdef SW_COROUTINE
  - sw_add_assoc_long_ex(return_value, ZEND_STRS("coroutine_num"), COROG->coro_num);
  + sw_add_assoc_long_ex(return_value, ZEND_STRS("coroutine_num"), COROG.coro_num);
  #endif
  }
  