[OBCDC] Fix the bug that obcdc exit when query server failed

src/logservice/libobcdc/src/ob_log_systable_helper.cpp

@@ -1438,7 +1438,7 @@ int ObLogSysTableHelper::do_query_(MySQLQueryBase &query)
       ret = OB_SUCCESS;
     }
 
-    if ((OB_SUCC(ret)) && !done) {
+    if (!done) {
       ret = OB_NEED_RETRY;
     }
   }