fix pointer print issue

when response_result fail, it will try to print row value. When the failure is caused by ctrl+c, neteasy memory is released in response_result function and row memory is invalid.

src/observer/mysql/ob_sync_cmd_driver.cpp

@@ -256,7 +256,7 @@ int ObSyncCmdDriver::response_query_result(ObMySQLResultSet& result)
           ctx_.schema_guard_,
           tmp_session->get_effective_tenant_id()));
       if (OB_FAIL(sender_.response_packet(rp))) {
-        LOG_WARN("response packet fail", K(ret), K(*row));
+        LOG_WARN("response packet fail", K(ret), KP(row));
       }
     }
   }