ipv4: Renamt struct rtable's rt_tos to rt_key_tos.

To more accurately reflect that it is purely a routing
cache lookup key and is used in no other context.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/route.h b/include/net/route.h
index 16eb59c..f07609e 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -52,7 +52,7 @@
 	int			rt_genid;
 	unsigned		rt_flags;
 	__u16			rt_type;
-	__u8			rt_tos;
+	__u8			rt_key_tos;
 
 	__be32			rt_dst;	/* Path destination	*/
 	__be32			rt_src;	/* Path source		*/