thermal: Use IS_ENABLED instead of #ifdef

Use IS_ENABLED(CONFIG_THERMAL_EMULATION) to make the code more readable
and to get rid of the addtional #ifdef around the variable definitions
in thermal_zone_get_temp().
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/thermal_core.c

@@ -477,11 +477,9 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 {
 	int ret = -EINVAL;
-#ifdef CONFIG_THERMAL_EMULATION
 	int count;
 	int crit_temp = INT_MAX;
 	enum thermal_trip_type type;
-#endif
 
 	if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
 		goto exit;
@@ -489,25 +487,21 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 	mutex_lock(&tz->lock);
 
 	ret = tz->ops->get_temp(tz, temp);
-#ifdef CONFIG_THERMAL_EMULATION
-	if (!tz->emul_temperature)
-		goto skip_emul;
 
+	if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
 		for (count = 0; count < tz->trips; count++) {
 			ret = tz->ops->get_trip_type(tz, count, &type);
 			if (!ret && type == THERMAL_TRIP_CRITICAL) {
-			ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
+				ret = tz->ops->get_trip_temp(tz, count,
+						&crit_temp);
 				break;
 			}
 		}
 
-	if (ret)
-		goto skip_emul;
-
-	if (*temp < crit_temp)
+		if (!ret && *temp < crit_temp)
 			*temp = tz->emul_temperature;
-skip_emul:
-#endif
+	}
+ 
 	mutex_unlock(&tz->lock);
 exit:
 	return ret;
@@ -866,7 +860,6 @@ available_policies_show(struct device *dev, struct device_attribute *devattr,
 	return count;
 }
 
-#ifdef CONFIG_THERMAL_EMULATION
 static ssize_t
 emul_temp_store(struct device *dev, struct device_attribute *attr,
 		     const char *buf, size_t count)
@@ -892,7 +885,6 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
 	return ret ? ret : count;
 }
 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
-#endif/*CONFIG_THERMAL_EMULATION*/
 
 static ssize_t
 sustainable_power_show(struct device *dev, struct device_attribute *devattr,
@@ -1822,11 +1814,12 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 			goto unregister;
 	}
 
-#ifdef CONFIG_THERMAL_EMULATION
+	if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
 		result = device_create_file(&tz->device, &dev_attr_emul_temp);
 		if (result)
 			goto unregister;
-#endif
+	}
+
 	/* Create policy attribute */
 	result = device_create_file(&tz->device, &dev_attr_policy);
 	if (result)