[IPV6]: Fix NS handing for proxy/anycast address

Timer set up by pneigh_enqueue() ended up calling ndisc_rcv()
via pndisc_redo(), which clears LOCALLY_ENQUEUED flag in
NEIGH_CB(skb) and NS was queued again.
Let's call ndisc_recv_ns() directly to avoid the loop.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ndisc.c

@@ -1450,7 +1450,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
 
 static void pndisc_redo(struct sk_buff *skb)
 {
-	ndisc_rcv(skb);
+	ndisc_recv_ns(skb);
 	kfree_skb(skb);
 }