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/ns83820.c b/drivers/net/ns83820.c
index 8e9b1a5..706aed7 100644
--- a/drivers/net/ns83820.c
+++ b/drivers/net/ns83820.c
@@ -568,8 +568,7 @@
 #endif
 
 	sg = dev->rx_info.descs + (next_empty * DESC_SIZE);
-	if (unlikely(NULL != dev->rx_info.skbs[next_empty]))
-		BUG();
+	BUG_ON(NULL != dev->rx_info.skbs[next_empty]);
 	dev->rx_info.skbs[next_empty] = skb;
 
 	dev->rx_info.next_empty = (next_empty + 1) % NR_RX_DESC;