ipv6: Kill rt6i_dev and rt6i_expires defines.

It just obscures that the netdevice pointer and the expires value are
implemented in the dst_entry sub-object of the ipv6 route.

And it makes grepping for dst_entry member uses much harder too.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 2783631..246d8e4 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -667,16 +667,16 @@
 				break;
 			}
 
-			if (iter->rt6i_dev == rt->rt6i_dev &&
+			if (iter->dst.dev == rt->dst.dev &&
 			    iter->rt6i_idev == rt->rt6i_idev &&
 			    ipv6_addr_equal(&iter->rt6i_gateway,
 					    &rt->rt6i_gateway)) {
 				if (!(iter->rt6i_flags & RTF_EXPIRES))
 					return -EEXIST;
-				iter->rt6i_expires = rt->rt6i_expires;
+				iter->dst.expires = rt->dst.expires;
 				if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 					iter->rt6i_flags &= ~RTF_EXPIRES;
-					iter->rt6i_expires = 0;
+					iter->dst.expires = 0;
 				}
 				return -EEXIST;
 			}
@@ -1521,8 +1521,8 @@
 	 *	only if they are not in use now.
 	 */
 
-	if (rt->rt6i_flags & RTF_EXPIRES && rt->rt6i_expires) {
-		if (time_after(now, rt->rt6i_expires)) {
+	if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) {
+		if (time_after(now, rt->dst.expires)) {
 			RT6_TRACE("expiring %p\n", rt);
 			return -1;
 		}