fix: coverity issues

source/dnode/mnode/impl/src/mndStream.c

@@ -958,7 +958,7 @@ static int32_t mndRetrieveStream(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pB
     colDataAppend(pColInfo, numOfRows, (const char *)&pStream->createTime, false);
 
     char sql[TSDB_SHOW_SQL_LEN + VARSTR_HEADER_SIZE] = {0};
-    STR_WITH_MAXSIZE_TO_VARSTR(streamName, pStream->sql, sizeof(sql));
+    STR_WITH_MAXSIZE_TO_VARSTR(sql, pStream->sql, sizeof(sql));
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
     colDataAppend(pColInfo, numOfRows, (const char *)sql, false);