[NETNS]: Add namespace parameter to ip_dev_find.

in_dev_find() need a namespace to pass it to fib_get_table(), so add
an argument.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 928bc32..1f5314c 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1395,7 +1395,7 @@
 		return idev;
 	}
 	if (imr->imr_address.s_addr) {
-		dev = ip_dev_find(imr->imr_address.s_addr);
+		dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
 		if (!dev)
 			return NULL;
 		dev_put(dev);