refactor: do some internal refactor.

source/dnode/vnode/src/tq/tq.c

@@ -978,17 +978,20 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
 
   tDecoderClear(&decoder);
 
+  SStreamMeta* pStreamMeta = pTq->pStreamMeta;
+
   // 2.save task, use the newest commit version as the initial start version of stream task.
-  taosWLockLatch(&pTq->pStreamMeta->lock);
-  code = streamMetaAddDeployedTask(pTq->pStreamMeta, sversion, pTask);
-  int32_t numOfTasks = streamMetaGetNumOfTasks(pTq->pStreamMeta);
+  taosWLockLatch(&pStreamMeta->lock);
+  code = streamMetaAddDeployedTask(pStreamMeta, sversion, pTask);
+
+  int32_t numOfTasks = streamMetaGetNumOfTasks(pStreamMeta);
   if (code < 0) {
     tqError("vgId:%d failed to add s-task:%s, total:%d", vgId, pTask->id.idStr, numOfTasks);
-    taosWUnLockLatch(&pTq->pStreamMeta->lock);
+    taosWUnLockLatch(&pStreamMeta->lock);
     return -1;
   }
 
-  taosWUnLockLatch(&pTq->pStreamMeta->lock);
+  taosWUnLockLatch(&pStreamMeta->lock);
 
   // 3.go through recover steps to fill history
   if (pTask->fillHistory) {