[TD-11106]<fix> taosdemo query crash (#8716)

src/kit/taosdemo/src/demoJsonOpt.c

@@ -854,6 +854,7 @@ int getMetaFromInsertJsonFile(cJSON *root) {
                     g_Dbs.db[i].superTbls[j].iface = STMT_IFACE;
                 } else if (0 == strcasecmp(stbIface->valuestring, "sml")) {
                     g_Dbs.db[i].superTbls[j].iface = SML_IFACE;
+                    g_args.iface = SML_IFACE;
                 } else {
                     errorPrint(
                         "failed to read json, insert_mode %s not recognized\n",

src/kit/taosdemo/src/demoUtil.c

@@ -204,13 +204,14 @@ int getChildNameOfSuperTableWithLimitAndOffset(TAOS *taos, char *dbName,
     int64_t   childTblCount = (limit < 0) ? DEFAULT_CHILDTABLES : limit;
     int64_t   count = 0;
     char *    childTblName = *childTblNameOfSuperTbl;
-    char *    pTblName = childTblName;
+
     if (childTblName == NULL) {
         childTblName = (char *)calloc(1, childTblCount * TSDB_TABLE_NAME_LEN);
         if (childTblName == NULL) {
             errorPrint("%s", "failed to allocate memory\n");
         }
     }
+    char *pTblName = childTblName;
 
     snprintf(limitBuf, 100, " limit %" PRId64 " offset %" PRIu64 "", limit,
              offset);