thermal/core: Drop valid pointer check for type

Drop the valid pointer check for type in
thermal_zone_device_register_with_trips() as we already have it confirmed
for != NULL from the previous if block.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220909181322.10933-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>