rt2x00: correct "skb_buff" typo

Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/wireless/rt2x00/rt2x00lib.h

@@ -91,7 +91,7 @@ static inline void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
 }
 
 static inline void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
-					  struct skb_buff *skb)
+					  struct sk_buff *skb)
 {
 }
 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */