fix recover error

source/libs/stream/src/streamBackendRocksdb.c

@@ -1492,8 +1492,7 @@ int32_t streamStateGetKVByCur_rocksdb(SStreamStateCur* pCur, SWinKey* pKey, cons
     }
 
     if (pVLen != NULL) {
-      size_t vlen = 0;
-
+      size_t      vlen = 0;
       const char* valStr = rocksdb_iter_value(pCur->iter, &vlen);
       *pVLen = decodeValueFunc((void*)valStr, vlen, NULL, (char**)&pVal);
     }