rt2x00: provide beacon's txdesc to write_beacon callback function.

Preparation to fix rt2800 beaconing.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index ca3707a..81f6db1 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1504,7 +1504,8 @@
 /*
  * TX data initialization
  */
-static void rt73usb_write_beacon(struct queue_entry *entry)
+static void rt73usb_write_beacon(struct queue_entry *entry,
+				 struct txentry_desc *txdesc)
 {
 	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);