rt2x00: Move TX descriptor field "ifs" into plcp substruct

"ifs" is only used by no-HT devices. Move it into the plcp substruct and
fill in the value only for no-HT devices.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h
index 3fa2406..7f8528d 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -311,6 +311,7 @@
 			u16 length_low;
 			u16 signal;
 			u16 service;
+			enum ifs ifs;
 		} plcp;
 
 		struct {
@@ -325,7 +326,6 @@
 	u16 rate_mode;
 
 	short retry_limit;
-	enum ifs ifs;
 
 	enum cipher cipher;
 	u16 key_idx;