[TD-6169]<fix>: windows dll client can not quit.

src/util/src/tcache.c

@@ -721,8 +721,6 @@ void* taosCacheTimedRefresh(void *handle) {
         continue;
       }
 
-      pthread_mutex_unlock(&guard);
-
       if ((count % pCacheObj->checkTick) != 0) {
         continue;
       }
@@ -742,6 +740,8 @@ void* taosCacheTimedRefresh(void *handle) {
       }
 
       taosTrashcanEmpty(pCacheObj, false);
+
+      pthread_mutex_unlock(&guard);
     }
   }