netfilter: nf_tables: drop module reference after updating chain

Otherwise the module reference counter is leaked.

Fixes b9703ed4 ("netfilter: nf_tables: support for adding new devices to an existing netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_api.c

@@ -2667,6 +2667,8 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 	nft_trans_basechain(trans) = basechain;
 	INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
 	list_splice(&hook.list, &nft_trans_chain_hooks(trans));
+	if (nla[NFTA_CHAIN_HOOK])
+		module_put(hook.type->owner);
 
 	nft_trans_commit_list_add_tail(ctx->net, trans);