netfilter: flowtable: remove nf_ct_l4proto_find() call

TCP and UDP are built-in conntrack protocol trackers and the flowtable
only supports for TCP and UDP, remove this call.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_flow_table_core.c

@@ -180,15 +180,10 @@ static void flow_offload_fixup_tcp(struct ip_ct_tcp *tcp)
 
 static void flow_offload_fixup_ct_timeout(struct nf_conn *ct)
 {
-	const struct nf_conntrack_l4proto *l4proto;
 	struct net *net = nf_ct_net(ct);
 	int l4num = nf_ct_protonum(ct);
 	unsigned int timeout;
 
-	l4proto = nf_ct_l4proto_find(l4num);
-	if (!l4proto)
-		return;
-
 	if (l4num == IPPROTO_TCP) {
 		struct nf_tcp_net *tn = nf_tcp_pernet(net);
 
@@ -273,15 +268,10 @@ static const struct rhashtable_params nf_flow_offload_rhash_params = {
 
 unsigned long flow_offload_get_timeout(struct flow_offload *flow)
 {
-	const struct nf_conntrack_l4proto *l4proto;
 	unsigned long timeout = NF_FLOW_TIMEOUT;
 	struct net *net = nf_ct_net(flow->ct);
 	int l4num = nf_ct_protonum(flow->ct);
 
-	l4proto = nf_ct_l4proto_find(l4num);
-	if (!l4proto)
-		return timeout;
-
 	if (l4num == IPPROTO_TCP) {
 		struct nf_tcp_net *tn = nf_tcp_pernet(net);