iio: adc: max1363: simplify using devm_regulator_get_enable()

Drop open-coded pattern: 'devm_regulator_get(), regulator_enable(),
add_action_or_reset(regulator_disable)' and use the
devm_regulator_get_enable() and drop the pointer to the regulator.
This simplifies code and makes it less tempting to add manual control
for the regulator which is also controlled by devm.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/1286ea127d190e5708a0aaff271819b2d3f8802d.1660934107.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/max1363.c

@@ -148,7 +148,6 @@ struct max1363_chip_info {
  * @chip_info:		chip model specific constants, available modes, etc.
  * @current_mode:	the scan mode of this chip
  * @requestedmask:	a valid requested set of channels
- * @reg:		supply regulator
  * @lock:		lock to ensure state is consistent
  * @monitor_on:		whether monitor mode is enabled
  * @monitor_speed:	parameter corresponding to device monitor speed setting
@@ -168,7 +167,6 @@ struct max1363_state {
 	const struct max1363_chip_info	*chip_info;
 	const struct max1363_mode	*current_mode;
 	u32				requestedmask;
-	struct regulator		*reg;
 	struct mutex			lock;
 
 	/* Using monitor modes and buffer at the same time is
@@ -1597,15 +1595,7 @@ static int max1363_probe(struct i2c_client *client,
 	st = iio_priv(indio_dev);
 
 	mutex_init(&st->lock);
-	st->reg = devm_regulator_get(&client->dev, "vcc");
-	if (IS_ERR(st->reg))
-		return PTR_ERR(st->reg);
-
-	ret = regulator_enable(st->reg);
-	if (ret)
-		return ret;
-
-	ret = devm_add_action_or_reset(&client->dev, max1363_reg_disable, st->reg);
+	ret = devm_regulator_get_enable(&client->dev, "vcc");
 	if (ret)
 		return ret;