[IPV6]: Freeing alive inet6 address

From: Denis V. Lunev <den@openvz.org>

addrconf_dad_failure calls addrconf_dad_stop which takes referenced address
and drops the count. So, in6_ifa_put perrformed at out: is extra. This
results in message: "Freeing alive inet6 address" and not released dst entries.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NAlexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ndisc.c

@@ -736,7 +736,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
 				 * so fail our DAD process
 				 */
 				addrconf_dad_failure(ifp);
-				goto out;
+				return;
 			} else {
 				/*
 				 * This is not a dad solicitation.