thermal: rcar_thermal: Always update thermal zone on interrupt

Since commit a1ade565 ("thermal: rcar: check every
rcar_thermal_update_temp() return value") the temperature is always read
in rcar_thermal_get_current_temp() so comparing it before and after
enabling interrupts have little effect. Remove the check and always
update the thermal zone when we get an interrupt that the temperature
have changed.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200310170029.1648996-2-niklas.soderlund+renesas@ragnatech.se

drivers/thermal/rcar_thermal.c

@@ -387,28 +387,17 @@ static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
 static void rcar_thermal_work(struct work_struct *work)
 {
 	struct rcar_thermal_priv *priv;
-	int cctemp, nctemp;
 	int ret;
 
 	priv = container_of(work, struct rcar_thermal_priv, work.work);
 
-	ret = rcar_thermal_get_current_temp(priv, &cctemp);
-	if (ret < 0)
-		return;
-
 	ret = rcar_thermal_update_temp(priv);
 	if (ret < 0)
 		return;
 
 	rcar_thermal_irq_enable(priv);
 
-	ret = rcar_thermal_get_current_temp(priv, &nctemp);
-	if (ret < 0)
-		return;
-
-	if (nctemp != cctemp)
-		thermal_zone_device_update(priv->zone,
-					   THERMAL_EVENT_UNSPECIFIED);
+	thermal_zone_device_update(priv->zone, THERMAL_EVENT_UNSPECIFIED);
 }
 
 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)