message: Fix MySQL coro invalid memory read.
diff: @@ -1250,21 +1250,21 @@ static PHP_METHOD(swoole_mysql_coro_statement, fetch)
  if (stmt->result)
  {
  - zval **args[1];
  + zval args[1];
  // the function argument is a reference
  ZVAL_NEW_REF(stmt->result, stmt->result);
  - args[0] = &stmt->result;
  + args[0] = *stmt->result;
  zval *fcn;
  SW_MAKE_STD_ZVAL(fcn);
  ZVAL_STRING(fcn, "array_shift");
  int ret;
  - zval *retval = NULL;
  - ret = sw_call_user_function_ex(EG(function_table), NULL, fcn, &retval, 1, args, 0, NULL TSRMLS_CC);
  + zval retval;
  + ret = call_user_function_ex(EG(function_table), NULL, fcn, &retval, 1, args, 0, NULL TSRMLS_CC);
  sw_zval_ptr_dtor(&fcn);
  ZVAL_UNREF(stmt->result);
  - if (ret == FAILURE || retval == NULL)
  + if (ret == FAILURE)
  {
  if (stmt->result)
  {
  @@ -1275,15 +1275,12 @@ static PHP_METHOD(swoole_mysql_coro_statement, fetch)
  }
  else
  {
  - zval _retval = *retval;
  - sw_zval_ptr_dtor(&retval);
  - retval = &_retval;
  if (php_swoole_array_length(stmt->result) == 0)
  {
  sw_zval_free(stmt->result);
  stmt->result = NULL;
  }
  - RETURN_ZVAL(retval, 0, 1);
  + RETURN_ZVAL(&retval, 0, 1);
  }
  }
  else
  