NFS: Fix up a typo in nfs_dns_ent_put

call_rcu() needs to take a first argument of type (struct rcu_head *).

Fixes: fd497f1e40d9 ("NFS: Lockless DNS lookups")
Signed-off-by: Trond Myklebust <[e-mail]>
Signed-off-by: J. Bruce Fields <[e-mail]>

fs/nfs/dns_resolve.c

···
 	struct nfs_dns_ent *item;
 
 	item = container_of(ref, struct nfs_dns_ent, h.ref);
-	call_rcu(item, nfs_dns_ent_free_rcu);
+	call_rcu(&item->rcu_head, nfs_dns_ent_free_rcu);
 }
 
 static struct cache_head *nfs_dns_ent_alloc(void)