dm cache policy mq: use list_del_init instead of list_del + INIT_LIST_HEAD

Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NJoe Thornber <ejt@redhat.com>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>

drivers/md/dm-cache-policy-mq.c

@@ -287,9 +287,8 @@ static struct entry *alloc_entry(struct entry_pool *ep)
 static struct entry *alloc_particular_entry(struct entry_pool *ep, dm_cblock_t cblock)
 {
 	struct entry *e = ep->entries + from_cblock(cblock);
-	list_del(&e->list);
 
-	INIT_LIST_HEAD(&e->list);
+	list_del_init(&e->list);
 	INIT_HLIST_NODE(&e->hlist);
 	ep->nr_allocated++;