inet: prepare net on the stack for NET accounting macros

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 29df75a..aab98b8 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -421,8 +421,9 @@
 	struct rtable *rt;
 	int flag = 0;
 	/*unsigned long now; */
+	struct net *net = dev_net(dev);
 
-	if (ip_route_output_key(dev_net(dev), &rt, &fl) < 0)
+	if (ip_route_output_key(net, &rt, &fl) < 0)
 		return 1;
 	if (rt->u.dst.dev != dev) {
 		NET_INC_STATS_BH(LINUX_MIB_ARPFILTER);