thermal: of: Use scoped device node handling to simplify of_thermal_zone_find()

Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20241010-b4-cleanup-h-of-node-put-thermal-v4-3-bfbe29ad81f4@linaro.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: krzk

drivers/thermal/thermal_of.c

@@ -125,10 +125,9 @@ static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
 
 static struct device_node *of_thermal_zone_find(struct device_node *sensor, int id)
 {
-	struct device_node *np, *tz;
 	struct of_phandle_args sensor_specs;
 
-	np = of_find_node_by_name(NULL, "thermal-zones");
+	struct device_node *np __free(device_node) = of_find_node_by_name(NULL, "thermal-zones");
 	if (!np) {
 		pr_debug("No thermal zones description\n");
 		return ERR_PTR(-ENODEV);
@@ -146,8 +145,7 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 						   "#thermal-sensor-cells");
 		if (count <= 0) {
 			pr_err("%pOFn: missing thermal sensor\n", child);
-			tz = ERR_PTR(-EINVAL);
-			goto out;
+			return ERR_PTR(-EINVAL);
 		}
 
 		for (i = 0; i < count; i++) {
@@ -159,22 +157,18 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 							 i, &sensor_specs);
 			if (ret < 0) {
 				pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", child, ret);
-				tz = ERR_PTR(ret);
-				goto out;
+				return ERR_PTR(ret);
 			}
 
 			if ((sensor == sensor_specs.np) && id == (sensor_specs.args_count ?
 								  sensor_specs.args[0] : 0)) {
 				pr_debug("sensor %pOFn id=%d belongs to %pOFn\n", sensor, id, child);
-				tz = no_free_ptr(child);
-				goto out;
+				return no_free_ptr(child);
 			}
 		}
 	}
-	tz = ERR_PTR(-ENODEV);
-out:
-	of_node_put(np);
-	return tz;
+
+	return ERR_PTR(-ENODEV);
 }
 
 static int thermal_of_monitor_init(struct device_node *np, int *delay, int *pdelay)