thermal: Use bool function return values of true/false not 1/0

Use the normal return values for bool functions

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/thermal_core.h

@@ -103,7 +103,7 @@ static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
 					    int trip)
 {
-	return 0;
+	return false;
 }
 static inline const struct thermal_trip *
 of_thermal_get_trip_points(struct thermal_zone_device *tz)