mac80211: use 4-byte mesh sequence number

This follows the new 802.11s/D2.0 draft.

Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 529f301..0b5e03e 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -113,7 +113,7 @@
 struct ieee80211s_hdr {
 	u8 flags;
 	u8 ttl;
-	u8 seqnum[3];
+	__le32 seqnum;
 	u8 eaddr1[6];
 	u8 eaddr2[6];
 	u8 eaddr3[6];