iio: adc: ad7793: Use devm_* APIs

devm_* APIs are device managed and make code simpler.

Signed-off-by: Sachin Kamat <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/ad7793.c

···
 		return -ENODEV;
 	}
 
-	indio_dev = iio_device_alloc(sizeof(*st));
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (indio_dev == NULL)
 		return -ENOMEM;
 
···
 	ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info);
 
 	if (pdata->refsel != AD7793_REFSEL_INTERNAL) {
-		st->reg = regulator_get(&spi->dev, "refin");
-		if (IS_ERR(st->reg)) {
-			ret = PTR_ERR(st->reg);
-			goto error_device_free;
-		}
+		st->reg = devm_regulator_get(&spi->dev, "refin");
+		if (IS_ERR(st->reg))
+			return PTR_ERR(st->reg);
 
 		ret = regulator_enable(st->reg);
 		if (ret)
-			goto error_put_reg;
+			return ret;
 
 		vref_mv = regulator_get_voltage(st->reg);
 		if (vref_mv < 0) {
···
 error_disable_reg:
 	if (pdata->refsel != AD7793_REFSEL_INTERNAL)
 		regulator_disable(st->reg);
-error_put_reg:
-	if (pdata->refsel != AD7793_REFSEL_INTERNAL)
-		regulator_put(st->reg);
-error_device_free:
-	iio_device_free(indio_dev);
 
 	return ret;
 }
···
 	iio_device_unregister(indio_dev);
 	ad_sd_cleanup_buffer_and_trigger(indio_dev);
 
-	if (pdata->refsel != AD7793_REFSEL_INTERNAL) {
+	if (pdata->refsel != AD7793_REFSEL_INTERNAL)
 		regulator_disable(st->reg);
-		regulator_put(st->reg);
-	}
-
-	iio_device_free(indio_dev);
 
 	return 0;
 }