rt2x00: Remove duplicate declaration

rt2x00queue_free_skb() was declared twice.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00lib.h

@@ -124,13 +124,6 @@ void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);
  */
 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);
 
-/**
- * rt2x00queue_free_skb - free a skb
- * @rt2x00dev: Pointer to &struct rt2x00_dev.
- * @skb: The skb to free.
- */
-void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);
-
 /**
  * rt2x00queue_write_tx_frame - Write TX frame to hardware
  * @queue: Queue over which the frame should be send