BUG_ON() Conversion in drivers/net/

this changes if() BUG(); constructs to BUG_ON() which is
cleaner, contains unlikely() and can better optimized away.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/net/tokenring/madgemc.c b/drivers/net/tokenring/madgemc.c
index 3a25d19..19e6f4d 100644
--- a/drivers/net/tokenring/madgemc.c
+++ b/drivers/net/tokenring/madgemc.c
@@ -735,8 +735,7 @@
 	struct net_local *tp;
         struct card_info *card;
 
-	if (!dev)
-		BUG();
+	BUG_ON(!dev);
 
 	tp = dev->priv;
 	card = tp->tmspriv;