ipvs: Simplify ipvs and net access in ip_vs_leave

Stop using the hack skb_net(skb) to compute the network namespace.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

net/netfilter/ipvs/ip_vs_core.c

@@ -568,21 +568,17 @@ int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 		struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph)
 {
 	__be16 _ports[2], *pptr, dport;
-	struct net *net;
-	struct netns_ipvs *ipvs;
+	struct netns_ipvs *ipvs = svc->ipvs;
+	struct net *net = ipvs->net;
 
 	pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
 	if (!pptr)
 		return NF_DROP;
 	dport = likely(!ip_vs_iph_inverse(iph)) ? pptr[1] : pptr[0];
 
-	net = skb_net(skb);
-
-
 	/* if it is fwmark-based service, the cache_bypass sysctl is up
 	   and the destination is a non-local unicast, then create
 	   a cache_bypass connection entry */
-	ipvs = net_ipvs(net);
 	if (sysctl_cache_bypass(ipvs) && svc->fwmark &&
 	    !(iph->hdr_flags & (IP_VS_HDR_INVERSE | IP_VS_HDR_ICMP)) &&
 	    ip_vs_addr_is_unicast(net, svc->af, &iph->daddr)) {