watchdog: retu_wdt: Clean-up by using managed work init

watchdog: retu_wdt: Clean-up by using managed work init

Few drivers implement remove call-back only for ensuring a delayed
work gets cancelled prior driver removal. Clean-up these by switching
to use devm_delayed_work_autocancel() instead.

This change is compile-tested only. All testing is appreciated.

Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/be299515fbee2c311162ca99ea0dbee933044b56.1616506559.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>