thermal: trip: Simplify computing trip indices
A trip index can be computed right away as a difference between the value of a trip pointer pointing to the given trip object and the start of the trips[] table in the given thermal zone, so change thermal_zone_trip_id() accordingly. No intentional functional impact (except for some speedup). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Tested-by: Lukasz Luba <lukasz.luba@arm.com>
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