ext4: Use BUG_ON() instead of BUG()

Author: Julia Lawall <julia@diku.dk>

if (...) BUG(); should be replaced with BUG_ON(...) when the test has no
side-effects to allow a definition of BUG_ON that drops the code completely.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// 
@ disable unlikely @ expression E,f; @@

(
  if (<... f(...) ...>) { BUG(); }
|
- if (unlikely(E)) { BUG(); }
+ BUG_ON(E);
)

@@ expression E,f; @@

(
  if (<... f(...) ...>) { BUG(); }
|
- if (E) { BUG(); }
+ BUG_ON(E);
)
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Andrew Morton 
Signed-off-by: "Theodore Ts'o" 

---
 fs/ext4/balloc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
 
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 9cc80b9..c29d774 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -409,8 +409,7 @@ restart:
 		prev = rsv;
 	}
 	printk("Window map complete.\n");
-	if (bad)
-		BUG();
+	BUG_ON(bad);
 }
 #define rsv_window_dump(root, verbose) \
 	__rsv_window_dump((root), (verbose), __func__)