[PATCH next] dm delay: Fix missing error code in delay_ctr()

[Harshit Mogalapalli]

When worker thread allocation fails, return error instead of
zero(success).

Also when kthread_create fails it returns ERR pointers and not NULL, so
fix that as well.

Fixes: c1fce71d29b2 ("dm delay: for short delays, use kthread instead of timers 
and wq")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapa...@oracle.com>
---
Smatch complained about the missing error code.
This patch is only compile tested.
---
 drivers/md/dm-delay.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 3d91804923eb..efd510984e25 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -280,8 +280,10 @@ static int delay_ctr(struct dm_target *ti, unsigned int 
argc, char **argv)
                 */
                dc->worker = kthread_create(&flush_worker_fn, dc,
                                            "dm-delay-flush-worker");
-               if (!dc->worker)
+               if (IS_ERR(dc->worker)) {
+                       ret = PTR_ERR(dc->worker);
                        goto bad;
+               }
        } else {
                timer_setup(&dc->delay_timer, handle_delayed_timer, 0);
                INIT_WORK(&dc->flush_expired_bios, flush_expired_bios);
-- 
2.39.3