xfrm: Simplify the allocation of slab caches in xfrm_policy_init

commit 0a31bd5f ("KMEM_CACHE(): simplify slab cache creation")
introduces a new macro.
Use the new KMEM_CACHE() macro instead of direct kmem_cache_create
to simplify the creation of SLAB caches.
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_policy.c

@@ -4163,10 +4163,7 @@ static int __net_init xfrm_policy_init(struct net *net)
 	int dir, err;
 
 	if (net_eq(net, &init_net)) {
-		xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
-					   sizeof(struct xfrm_dst),
-					   0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
-					   NULL);
+		xfrm_dst_cache = KMEM_CACHE(xfrm_dst, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
 		err = rhashtable_init(&xfrm_policy_inexact_table,
 				      &xfrm_pol_inexact_params);
 		BUG_ON(err);