fix(stream): set the initial value.

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

@@ -47,7 +47,7 @@ int tqStreamTasksScanWal(STQ* pTq) {
       }
 
       taosWUnLockLatch(&pMeta->lock);
-      tqInfo("vgId:%d scan wal for stream tasks for %d times", vgId, times);
+      tqDebug("vgId:%d scan wal for stream tasks for %d times", vgId, times);
     } else {
       ASSERT(pMeta->walScan >= 1);
     }

source/libs/stream/src/streamMeta.c

@@ -61,6 +61,7 @@ SStreamMeta* streamMetaOpen(const char* path, void* ahandle, FTaskExpand expandF
     goto _err;
   }
 
+  pMeta->walScan = 0;
   pMeta->vgId = vgId;
   pMeta->ahandle = ahandle;
   pMeta->expandFunc = expandFunc;