regulator: max8997: Use scoped device node handling to simplify error paths

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

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/max8997-regulator.c

···
 // This driver is based on max8998.c
 
 #include <linux/bug.h>
+#include <linux/cleanup.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
 #include <linux/slab.h>
···
 					struct max8997_platform_data *pdata)
 {
 	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
-	struct device_node *pmic_np, *regulators_np, *reg_np;
+	struct device_node *pmic_np, *reg_np;
 	struct max8997_regulator_data *rdata;
 	unsigned int i, dvs_voltage_nr = 1;
 
···
 		return -ENODEV;
 	}
 
-	regulators_np = of_get_child_by_name(pmic_np, "regulators");
+	struct device_node *regulators_np __free(device_node) = of_get_child_by_name(pmic_np,
+										     "regulators");
 	if (!regulators_np) {
 		dev_err(&pdev->dev, "could not find regulators sub-node\n");
 		return -EINVAL;
···
 	rdata = devm_kcalloc(&pdev->dev,
 			     pdata->num_regulators, sizeof(*rdata),
 			     GFP_KERNEL);
-	if (!rdata) {
-		of_node_put(regulators_np);
+	if (!rdata)
 		return -ENOMEM;
-	}
 
 	pdata->regulators = rdata;
 	for_each_child_of_node(regulators_np, reg_np) {
···
 		rdata->reg_node = reg_np;
 		rdata++;
 	}
-	of_node_put(regulators_np);
 
 	pdata->buck1_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs");
 	pdata->buck2_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs");