[PATCH resend] loop: Fix IS_ERR() vs NULL bugs in loop_prepare_queue()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

The alloc_workqueue() function returns NULL on error, it never returns
error pointers.

Fixes: 29dab2122492 ("loop: use worker per cgroup instead of kworker")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Dan Schatzberg <schatzberg.dan@xxxxxxxxx>
---
Resending because this goes through your -mm tree, Andrew.  The
get_maintainer.pl script lead me astray.

 drivers/block/loop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index da8ec0b9d909..a31ca5e04fae 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -897,7 +897,7 @@ static int loop_prepare_queue(struct loop_device *lo)
 					WQ_UNBOUND | WQ_FREEZABLE |
 					WQ_MEM_RECLAIM,
 					lo->lo_number);
-	if (IS_ERR(lo->workqueue))
+	if (!lo->workqueue)
 		return -ENOMEM;
 
 	return 0;
-- 
2.11.0