refactor: do some internal refactor.

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

@@ -1086,12 +1086,12 @@ int32_t mndTransProcessRsp(SRpcMsg *pRsp) {
     goto _OVER;
   }
 
-  pTrans->lastErrorNo = pRsp->code;
-
   STransAction *pAction = taosArrayGet(pArray, action);
   if (pAction != NULL) {
     pAction->msgReceived = 1;
     pAction->errCode = pRsp->code;
+    pTrans->lastErrorNo = pRsp->code;
+
     mInfo("trans:%d, %s:%d response is received, code:0x%x, accept:0x%x retry:0x%x", transId,
           mndTransStr(pAction->stage), action, pRsp->code, pAction->acceptableCode, pAction->retryCode);
   } else {