iio: dac: lpc18xx: Use devm_platform_ioremap_resource

Reduce boilerplate.
Suggested by coccinelle
  CHECK   drivers/iio/dac/lpc18xx_dac.c
drivers/iio/dac/lpc18xx_dac.c:121:1-10: WARNING: Use devm_platform_ioremap_resource for dac -> base
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
CC: Joachim Eastwood <manabian@gmail.com>

drivers/iio/dac/lpc18xx_dac.c

@@ -106,7 +106,6 @@ static int lpc18xx_dac_probe(struct platform_device *pdev)
 {
 	struct iio_dev *indio_dev;
 	struct lpc18xx_dac *dac;
-	struct resource *res;
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*dac));
@@ -117,8 +116,7 @@ static int lpc18xx_dac_probe(struct platform_device *pdev)
 	dac = iio_priv(indio_dev);
 	mutex_init(&dac->lock);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dac->base = devm_ioremap_resource(&pdev->dev, res);
+	dac->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(dac->base))
 		return PTR_ERR(dac->base);