netfilter: nftables: Fix a memleak from userdata error path in new objects

Release object name if userdata allocation fails.

Fixes: b131c964 ("netfilter: nf_tables: add userdata support for nft_object")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_api.c

@@ -6615,9 +6615,9 @@ static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
 	INIT_LIST_HEAD(&obj->list);
 	return err;
 err_trans:
-	kfree(obj->key.name);
-err_userdata:
 	kfree(obj->udata);
+err_userdata:
+	kfree(obj->key.name);
 err_strdup:
 	if (obj->ops->destroy)
 		obj->ops->destroy(&ctx, obj);