inet: toss struct net initialization around

Some places, that deal with ICMP statistics already have where
to get a struct net from, but use it directly, without declaring
a separate variable on the stack.

Since I will need this net soon, I declare a struct net on the
stack and use it in the existing places in a separate patch not
to spoil the future ones.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 1ffe7ad..56d6b94 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -973,6 +973,7 @@
 {
 	struct icmphdr *icmph;
 	struct rtable *rt = skb->rtable;
+	struct net *net = dev_net(rt->u.dst.dev);
 
 	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
 		int nh;
@@ -1027,9 +1028,6 @@
 	 */
 
 	if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) {
-		struct net *net;
-
-		net = dev_net(rt->u.dst.dev);
 		/*
 		 *	RFC 1122: 3.2.2.6 An ICMP_ECHO to broadcast MAY be
 		 *	  silently ignored (we let user decide with a sysctl).