dccp: Evaluate ip_hdr() only once in dccp_v4_route_skb().

This also works around a bogus gcc warning generated by an
upcoming patch from Eric Dumazet that rearranges the layout
of struct flowi4.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 3f4e5414c8e5..1c67fe8ff90d 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -474,10 +474,11 @@ static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk,
                                            struct sk_buff *skb)
 {
         struct rtable *rt;
+        const struct iphdr *iph = ip_hdr(skb);
         struct flowi4 fl4 = {
                 .flowi4_oif = skb_rtable(skb)->rt_iif,
-                .daddr = ip_hdr(skb)->saddr,
-                .saddr = ip_hdr(skb)->daddr,
+                .daddr = iph->saddr,
+                .saddr = iph->daddr,
                 .flowi4_tos = RT_CONN_FLAGS(sk),
                 .flowi4_proto = sk->sk_protocol,
                 .fl4_sport = dccp_hdr(skb)->dccph_dport,