[td-225] fix bugs in regression test.

src/client/src/tscStream.c

@@ -615,10 +615,9 @@ void taos_close_stream(TAOS_STREAM *handle) {
     tscDebug("%p stream:%p is closed", pSql, pStream);
     // notify CQ to release the pStream object
     pStream->fp(pStream->param, NULL, NULL);
+    taos_free_result(pSql);
 
-    tscFreeSqlObj(pSql);
     pStream->pSql = NULL;
-
     taosTFree(pStream);
   }
 }