[IPV4]: Convert ipv4 route to use the new dst_entry 'next' pointer

This patch removes the rt_next pointer from 'struct rtable.u' union,
and renames u.rt_next to u.dst_rt_next.

It also moves 'struct flowi' right after 'struct dst_entry' to prepare
the gain on lookups.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/route.h b/include/net/route.h
index 1440bdb..749e4df 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -53,9 +53,11 @@
 	union
 	{
 		struct dst_entry	dst;
-		struct rtable		*rt_next;
 	} u;
 
+	/* Cache lookup keys */
+	struct flowi		fl;
+
 	struct in_device	*idev;
 	
 	unsigned		rt_flags;
@@ -69,9 +71,6 @@
 	/* Info on neighbour */
 	__be32			rt_gateway;
 
-	/* Cache lookup keys */
-	struct flowi		fl;
-
 	/* Miscellaneous cached information */
 	__be32			rt_spec_dst; /* RFC1122 specific destination */
 	struct inet_peer	*peer; /* long-living peer info */