net/ipv6: Remove extra call to ip6_convert_metrics for multipath case

The change to move metrics from the dst to rt6_info moved the call
to ip6_convert_metrics from ip6_route_add to ip6_route_info_create. In
doing so it makes the call in ip6_route_info_append redundant and
actually leaks the metrics installed as part of the ip6_route_info_create.
Remove the now unnecessary call.

Fixes: d4ead6b34b67f ("net/ipv6: move metrics from dst to rt6_info")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -4321,11 +4321,6 @@ static int ip6_route_info_append(struct net *net,
 	if (!nh)
 		return -ENOMEM;
 	nh->fib6_info = rt;
-	err = ip6_convert_metrics(net, rt, r_cfg);
-	if (err) {
-		kfree(nh);
-		return err;
-	}
 	memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
 	list_add_tail(&nh->next, rt6_nh_list);