dm delay: Use DM_MAPIO macros instead of open-coded equivalents

.map function of dm-delay returns return value of delay_bio(),
hence it's supposed to return using a defined DM_MAPIO macro.

Signed-off-by: Tomohiro Kusumi <[email protected]>
Acked-By: Mikulas Patocka <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
1 file changed