fixed issue #5453 , skipping Query_log_event by unknown status vars

dbsync/src/main/java/com/taobao/tddl/dbsync/binlog/event/QueryLogEvent.java

@@ -835,7 +835,7 @@ public class QueryLogEvent extends LogEvent {
                          */
                         logger.error("Query_log_event has unknown status vars (first has code: " + code
                                      + "), skipping the rest of them");
-                        break; // Break loop
+                        return; // Break loop
                 }
             }
         } catch (RuntimeException e) {