BUG_ON() Conversion in kernel/fork.c

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/kernel/fork.c b/kernel/fork.c
index a020639..d93ab2b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -769,8 +769,7 @@
 	struct files_struct *files  = current->files;
 	int rc;
 
-	if(!files)
-		BUG();
+	BUG_ON(!files);
 
 	/* This can race but the race causes us to copy when we don't
 	   need to and drop the copy */