net/netfilter: make use of the helper macro LIST_HEAD()

list_head can be initialized automatically with LIST_HEAD()
instead of calling INIT_LIST_HEAD(). Here we can simplify
the code.
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://patch.msgid.link/20240904093243.3345012-4-lihongbo22@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/netfilter/core.c

@@ -655,11 +655,9 @@ void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
 		       const struct nf_hook_entries *e)
 {
 	struct sk_buff *skb, *next;
-	struct list_head sublist;
+	LIST_HEAD(sublist);
 	int ret;
 
-	INIT_LIST_HEAD(&sublist);
-
 	list_for_each_entry_safe(skb, next, head, list) {
 		skb_list_del_init(skb);
 		ret = nf_hook_slow(skb, state, e, 0);