rt2x00: Only free skb when beacon_update fails

In rt2x00lib_intf_scheduled_iter() we use the hw->beacon_update()
callback function. This means that it should behave similarly as mac80211
when that uses the function.

This means that the skb should only be freed when beacon_update() has failed,
otherwise the driver is the owner and is responsible for freeing the buffer.
Signed-off-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -433,12 +433,10 @@ static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 
 	if (delayed_flags & DELAYED_UPDATE_BEACON) {
 		skb = ieee80211_beacon_get(rt2x00dev->hw, vif, &control);
-		if (skb) {
-			rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
-							  &control);
+		if (skb && rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
+							     skb, &control))
 			dev_kfree_skb(skb);
 	}
-	}
 
 	if (delayed_flags & DELAYED_CONFIG_ERP)
 		rt2x00lib_config_erp(rt2x00dev, intf, &intf->conf);