platform/surface: aggregator: Drop unnecessary variable initialization

The status variable in ssam_controller_event_disable() is always set, no
need to initialize it.

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20210604210907.25738-3-luzmaximilian@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>