ieee802154: atusb: switch from BUG_ON() to WARN_ON() on problem

The check is valid but it does not warrant to crash the kernel. A
WARN_ON() is good enough here.
Found by checkpatch.

Signed-off-by: Stefan Schmidt <stefan@osg.samsung.com>

drivers/net/ieee802154/atusb.c

@@ -403,7 +403,7 @@ static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
 
 static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
 {
-	BUG_ON(!level);
+	WARN_ON(!level);
 	*level = 0xbe;
 	return 0;
 }