netfilter: conntrack: remove net_id

No users anymore.

Signed-off-by: Florian Westphal <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/net/netfilter/nf_conntrack_l4proto.h

···
 	/* Print out the private part of the conntrack. */
 	void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
 #endif
-	unsigned int	*net_id;
+
 	/* Init l4proto pernet data */
 	int (*init_net)(struct net *net);
 

net/netfilter/nf_conntrack_proto.c

···
 static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
 				const struct nf_conntrack_l4proto *l4proto)
 {
-	if (l4proto->get_net_proto) {
-		/* statically built-in protocols use static per-net */
+	if (l4proto->get_net_proto)
 		return l4proto->get_net_proto(net);
-	} else if (l4proto->net_id) {
-		/* ... and loadable protocols use dynamic per-net */
-		return net_generic(net, *l4proto->net_id);
-	}
+
 	return NULL;
 }