[patch] md/dm-log: use PTR_ERR value instead of -ENOMEM

[Dan Carpenter <error27@gmail.com>]

It's nicer to return the PTR_ERR() value instead of just returning
-ENOMEM.  In the current code the PTR_ERR() value is always equal to
-ENOMEM so this doesn't actually affect anything, but still...

Signed-off-by: Dan Carpenter <error27@gmail.com>

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 5a08be0..fbd80fb 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -455,7 +455,7 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
 			r = PTR_ERR(lc->io_req.client);
 			DMWARN("couldn't allocate disk io client");
 			kfree(lc);
-			return -ENOMEM;
+			return r;
 		}
 
 		lc->disk_header = vmalloc(buf_size);