ipv6: Fix warning in addrconf code.

Reported by Linus.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 580ae50..9f4fcce 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2315,12 +2315,11 @@
 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
 {
 	struct inet6_ifaddr * ifp;
-	struct net *net = dev_net(idev->dev);
 	u32 addr_flags = IFA_F_PERMANENT;
 
 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 	if (idev->cnf.optimistic_dad &&
-	    !net->ipv6.devconf_all->forwarding)
+	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
 		addr_flags |= IFA_F_OPTIMISTIC;
 #endif