"ret" should be signed for the error handling to work correctly.  This
doesn't matter much in real life since mtk_wdt_set_timeout() always
succeeds.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>