ipvs: Hoist computation of ipvs earlier in sctp_conn_schedule

The addition of sysctl_sloppy_sctp in sctp_conn_schedule resulted
in a use of ipvs before it was computed.  Hoist the computation of
ipvs earlier to avoid this problem.
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_proto_sctp.c

@@ -20,6 +20,9 @@ sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 	sctp_sctphdr_t *sh, _sctph;
 	__be16 _ports[2], *ports = NULL;
 
+	net = skb_net(skb);
+	ipvs = net_ipvs(net);
+
 	if (likely(!ip_vs_iph_icmp(iph))) {
 		sh = skb_header_pointer(skb, iph->len, sizeof(_sctph), &_sctph);
 		if (sh) {
@@ -40,8 +43,6 @@ sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 		return 0;
 	}
 
-	net = skb_net(skb);
-	ipvs = net_ipvs(net);
 	rcu_read_lock();
 	if (likely(!ip_vs_iph_inverse(iph)))
 		svc = ip_vs_service_find(net, af, skb->mark, iph->protocol,