net: ipv6: minor: use in6addr_any in token init

Since we check for !ipv6_addr_any(&in6_dev->token) in
addrconf_prefix_rcv(), make the token initialization on
device setup more intuitive by using in6addr_any as an
initializer.

Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -422,7 +422,7 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 		ipv6_regen_rndid((unsigned long) ndev);
 	}
 #endif
-	memset(ndev->token.s6_addr, 0, sizeof(ndev->token.s6_addr));
+	ndev->token = in6addr_any;
 
 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
 		ndev->if_flags |= IF_READY;