[NETFILTER]: nf_conntrack: remove unused struct list_head from protocols

Remove unused struct list_head from struct nf_conntrack_l3proto and
nf_conntrack_l4proto as all protocols are kept in arrays, not linked
lists.
Signed-off-by: Martin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: Patrick McHardy <kaber@trash.net>

include/net/netfilter/nf_conntrack_l3proto.h

@@ -18,9 +18,6 @@ struct nfattr;
 
 struct nf_conntrack_l3proto
 {
-	/* Next pointer. */
-	struct list_head list;
-
 	/* L3 Protocol Family number. ex) PF_INET */
 	u_int16_t l3proto;
 

include/net/netfilter/nf_conntrack_l4proto.h

@@ -16,9 +16,6 @@ struct nfattr;
 
 struct nf_conntrack_l4proto
 {
-	/* Next pointer. */
-	struct list_head list;
-
 	/* L3 Protocol number. */
 	u_int16_t l3proto;
 

net/ipv4/netfilter/nf_conntrack_proto_icmp.c

@@ -323,7 +323,6 @@ static int icmp_nfattr_to_tuple(struct nfattr *tb[],
 
 struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp =
 {
-	.list			= { NULL, NULL },
 	.l3proto		= PF_INET,
 	.l4proto		= IPPROTO_ICMP,
 	.name			= "icmp",