thermal: trip: Constify thermal zone argument of thermal_zone_trip_id()

Because thermal_zone_trip_id() does not update the thermal zone object
passed to it, its pointer argument representing the thermal zone can be
const, so adjust its definition accordingly.

No functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>

drivers/thermal/thermal_core.h

@@ -123,7 +123,7 @@ void thermal_governor_update_tz(struct thermal_zone_device *tz,
 	for (__trip = __tz->trips; __trip - __tz->trips < __tz->num_trips; __trip++)
 
 void __thermal_zone_set_trips(struct thermal_zone_device *tz);
-int thermal_zone_trip_id(struct thermal_zone_device *tz,
+int thermal_zone_trip_id(const struct thermal_zone_device *tz,
 			 const struct thermal_trip *trip);
 void thermal_zone_trip_updated(struct thermal_zone_device *tz,
 			       const struct thermal_trip *trip);

drivers/thermal/thermal_trip.c

@@ -143,7 +143,7 @@ int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_trip);
 
-int thermal_zone_trip_id(struct thermal_zone_device *tz,
+int thermal_zone_trip_id(const struct thermal_zone_device *tz,
 			 const struct thermal_trip *trip)
 {
 	/*