If unsigned the watchdog_trigger() return value will not be
checked correctly.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Acked-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: NJean Delvare <khali@linux-fr.org>