macintosh: smu_sensors: use for_each_child_of_node() macro

Use for_each_child_of_node() macro instead of open coding it.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200916062125.190729-1-miaoqinglang@huawei.com

drivers/macintosh/windfarm_smu_sensors.c

@@ -421,8 +421,7 @@ static int __init smu_sensors_init(void)
 		return -ENODEV;
 
 	/* Look for sensors subdir */
-	for (sensors = NULL;
-	     (sensors = of_get_next_child(smu, sensors)) != NULL;)
+	for_each_child_of_node(smu, sensors)
 		if (of_node_name_eq(sensors, "sensors"))
 			break;