BUG_ON() Conversion in md/bitmap.c

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

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

drivers/md/bitmap.c

@@ -1309,7 +1309,7 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect
 		case 1:
 			*bmc = 2;
 		}
-		if ((*bmc & COUNTER_MAX) == COUNTER_MAX) BUG();
+		BUG_ON((*bmc & COUNTER_MAX) == COUNTER_MAX);
 		(*bmc)++;
 
 		spin_unlock_irq(&bitmap->lock);