[PATCH] zram: fix NULL check before some freeing functions is not needed

fixed the below warning:
/drivers/block/zram/zram_drv.c:534:2-8: WARNING: NULL check
before some freeing functions is not needed.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
---
 drivers/block/zram/zram_drv.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index e2933cb..92739b9 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c

@@ -530,8 +530,7 @@ static ssize_t backing_dev_store(struct device *dev,
 
 	return len;
 out:
-	if (bitmap)
-		kvfree(bitmap);
+	kvfree(bitmap);
 
 	if (bdev)
 		blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);

-- 
2.7.4