[IPV6]: Misc endianness annotations.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index d3915dab..475b10c 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -66,8 +66,8 @@
 
 struct ra_msg {
         struct icmp6hdr		icmph;
-	__u32			reachable_time;
-	__u32			retrans_timer;
+	__be32			reachable_time;
+	__be32			retrans_timer;
 };
 
 struct nd_opt_hdr {