udp: reorder udp_iter_state to remove padding on 64bit builds

reorder udp_iter_state to remove padding on 64bit builds

shrinks from 24 to 16 bytes, moving to a smaller slab when
CONFIG_NET_NS is undefined & seq_net_private = {}
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/udp.h

@@ -196,8 +196,8 @@ struct udp_seq_afinfo {
 struct udp_iter_state {
 	struct seq_net_private  p;
 	sa_family_t		family;
-	struct hlist_head	*hashtable;
 	int			bucket;
+	struct hlist_head	*hashtable;
 };
 
 #ifdef CONFIG_PROC_FS