ipmr: Simplify the allocation of slab caches

Use the new KMEM_CACHE() macro instead of direct kmem_cache_create
to simplify the creation of SLAB caches.
And change cache name from 'ip_mrt_cache' to 'mfc_cache'.
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ipmr.c

@@ -3139,10 +3139,7 @@ int __init ip_mr_init(void)
 {
 	int err;
 
-	mrt_cachep = kmem_cache_create("ip_mrt_cache",
-				       sizeof(struct mfc_cache),
-				       0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
-				       NULL);
+	mrt_cachep = KMEM_CACHE(mfc_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
 
 	err = register_pernet_subsys(&ipmr_net_ops);
 	if (err)