nfsd: Simplify the allocation of slab caches in nfsd4_init_pnfs

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: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs4layouts.c

@@ -777,13 +777,11 @@ nfsd4_init_pnfs(void)
 	for (i = 0; i < DEVID_HASH_SIZE; i++)
 		INIT_LIST_HEAD(&nfsd_devid_hash[i]);
 
-	nfs4_layout_cache = kmem_cache_create("nfs4_layout",
-			sizeof(struct nfs4_layout), 0, 0, NULL);
+	nfs4_layout_cache = KMEM_CACHE(nfs4_layout, 0);
 	if (!nfs4_layout_cache)
 		return -ENOMEM;
 
-	nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
-			sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
+	nfs4_layout_stateid_cache = KMEM_CACHE(nfs4_layout_stateid, 0);
 	if (!nfs4_layout_stateid_cache) {
 		kmem_cache_destroy(nfs4_layout_cache);
 		return -ENOMEM;