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/ne2k-pci.c b/drivers/net/ne2k-pci.c
index d11821d..ced9fdb 100644
--- a/drivers/net/ne2k-pci.c
+++ b/drivers/net/ne2k-pci.c
@@ -645,9 +645,7 @@
 {
 	struct net_device *dev = pci_get_drvdata(pdev);
 
-	if (!dev)
-		BUG();
-
+	BUG_ON(!dev);
 	unregister_netdev(dev);
 	release_region(dev->base_addr, NE_IO_EXTENT);
 	free_netdev(dev);