fix the issue that deref pNew pointer after free

src/system/detail/src/vnodeMeter.c

@@ -791,10 +791,11 @@ void vnodeUpdateMeter(void *param, void *tmrId) {
       vnodeClearMeterState(pObj, TSDB_METER_STATE_UPDATING);
       free(pNew->schema);
       free(pNew);
-    }
-
+    } else {
       dTrace("vid:%d sid:%d meterId:%s, there are data in cache, commit first, update later",
            pNew->vnode, pNew->sid, pNew->meterId);
+    }
+
     vnodeClearMeterState(pObj, TSDB_METER_STATE_UPDATING);
     return;
   }