Merge pull request #4211 from taosdata/hotfix/TD-2084

[TD-2084]<hotfix>: invalid read when close TSDB

src/tsdb/src/tsdbMemTable.c

@@ -462,8 +462,8 @@ _exit:
   tdFreeDataCols(pDataCols);
   tsdbDestroyCommitIters(iters, pMem->maxTables);
   tsdbDestroyHelper(&whelper);
-  tsdbEndCommit(pRepo);
   tsdbInfo("vgId:%d commit over", pRepo->config.tsdbId);
+  tsdbEndCommit(pRepo);
 
   return NULL;
 }