[NETNS]: Don't initialize err variable twice.

The ip6_route_net_init() performs some unneeded actions.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -2614,9 +2614,8 @@ struct ctl_table *ipv6_route_sysctl_init(struct net *net)
 
 static int ip6_route_net_init(struct net *net)
 {
-	int ret = 0;
+	int ret = -ENOMEM;
 
-	ret = -ENOMEM;
 	net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template,
 					sizeof(*net->ipv6.ip6_dst_ops),
 					GFP_KERNEL);