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/net/mac80211/mesh.h b/net/mac80211/mesh.h
index 742003d..9f8cb76 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -139,7 +139,7 @@
 
 struct mesh_rmc {
 	struct rmc_entry bucket[RMC_BUCKETS];
-	u8 idx_mask;
+	u32 idx_mask;
 };