[td-225]refactor code: remove useless codes

src/client/src/tscLocal.c

@@ -384,14 +384,11 @@ int tscProcessLocalCmd(SSqlObj *pSql) {
 
   // keep the code in local variable in order to avoid invalid read in case of async query
   int32_t code = pSql->res.code;
-
-  if (pSql->fp != NULL) {  // callback function
-    if (code == 0) {
+  if (code == TSDB_CODE_SUCCESS) {
     (*pSql->fp)(pSql->param, pSql, 0);
   } else {
     tscQueueAsyncRes(pSql);
   }
-  }
 
   return code;
 }