wireless: Remove unnecessary casts of usb_get_intfdata

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/p54usb.c b/drivers/net/wireless/p54/p54usb.c
index d5bc21e..dd4d8fc 100644
--- a/drivers/net/wireless/p54/p54usb.c
+++ b/drivers/net/wireless/p54/p54usb.c
@@ -183,7 +183,7 @@
 static void p54u_tx_cb(struct urb *urb)
 {
 	struct sk_buff *skb = urb->context;
-	struct ieee80211_hw *dev = (struct ieee80211_hw *)
+	struct ieee80211_hw *dev =
 		usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 
 	p54_free_skb(dev, skb);