netfilter: nf_tables: remove flag field from struct nft_af_info

Replace it by a direct check for the netdev protocol family.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables.h

@@ -964,10 +964,6 @@ struct nft_table {
 	char				*name;
 };
 
-enum nft_af_flags {
-	NFT_AF_NEEDS_DEV	= (1 << 0),
-};
-
 /**
  *	struct nft_af_info - nf_tables address family info
  *
@@ -975,14 +971,12 @@ enum nft_af_flags {
  *	@family: address family
  *	@owner: module owner
  *	@tables: used internally
- *	@flags: family flags
  */
 struct nft_af_info {
 	struct list_head		list;
 	int				family;
 	struct module			*owner;
 	struct list_head		tables;
-	u32				flags;
 };
 
 int nft_register_afinfo(struct net *, struct nft_af_info *);

net/netfilter/nf_tables_api.c

@@ -1350,7 +1350,7 @@ static int nft_chain_parse_hook(struct net *net,
 	hook->type = type;
 
 	hook->dev = NULL;
-	if (afi->flags & NFT_AF_NEEDS_DEV) {
+	if (afi->family == NFPROTO_NETDEV) {
 		char ifname[IFNAMSIZ];
 
 		if (!ha[NFTA_HOOK_DEV]) {

net/netfilter/nf_tables_netdev.c

@@ -41,7 +41,6 @@ nft_do_chain_netdev(void *priv, struct sk_buff *skb,
 static struct nft_af_info nft_af_netdev __read_mostly = {
 	.family		= NFPROTO_NETDEV,
 	.owner		= THIS_MODULE,
-	.flags		= NFT_AF_NEEDS_DEV,
 };
 
 static int nf_tables_netdev_init_net(struct net *net)