net-next: remove useless union keyword

remove useless union keyword in rtable, rt6_info and dn_route.

Since there is only one member in a union, the union keyword isn't useful.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 1705476..3493270 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -37,7 +37,7 @@
 		fl.fl4_src = saddr->a4;
 
 	err = __ip_route_output_key(net, &rt, &fl);
-	dst = &rt->u.dst;
+	dst = &rt->dst;
 	if (err)
 		dst = ERR_PTR(err);
 	return dst;