[IPV6]: Remove bogus WARN_ON in Proxy-NA handling.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 0304b5f..41a8a5f 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -967,8 +967,6 @@
 		    ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
 		    pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) {
 			/* XXX: idev->cnf.prixy_ndp */
-			WARN_ON(skb->dst != NULL &&
-				((struct rt6_info *)skb->dst)->rt6i_idev);
 			goto out;
 		}