net ipv6: Remove rebundant rt6i_nsiblings initialization

Seting rt->rt6i_nsiblings to zero is rebundant, because above memset
zeroed the rest of rt excluding the first dst memember.
Signed-off-by: Fan Du <fan.du@windriver.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -285,7 +285,6 @@ static inline struct rt6_info *ip6_dst_alloc(struct net *net,
 		rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
 		rt->rt6i_genid = rt_genid(net);
 		INIT_LIST_HEAD(&rt->rt6i_siblings);
-		rt->rt6i_nsiblings = 0;
 	}
 	return rt;
 }