[IPV6] ROUTE: Use &rt->u.dst instead of cast.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index 8377477..25804cb 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -63,7 +63,7 @@
 		fib_rule_put(arg.rule);
 
 	if (arg.result)
-		return (struct dst_entry *) arg.result;
+		return arg.result;
 
 	dst_hold(&ip6_null_entry.u.dst);
 	return &ip6_null_entry.u.dst;