iio: adc: xilinx: use helper variable for &pdev->dev

It's more elegant to use a helper local variable to store the address
of the underlying struct device than to dereference pdev everywhere.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Tested-by: Anand Ashok Dumbre <anandash@xilinx.com>
Reviewed-by: Anand Ashok Dumbre <anandash@xilinx.com>
Link: https://lore.kernel.org/r/20201130142759.28216-2-brgl@bgdev.plSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/xilinx-xadc-core.c

@@ -1287,6 +1287,7 @@ static const char * const xadc_type_names[] = {
 
 static int xadc_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	const struct of_device_id *id;
 	struct iio_dev *indio_dev;
 	unsigned int bipolar_mask;
@@ -1296,10 +1297,10 @@ static int xadc_probe(struct platform_device *pdev)
 	int irq;
 	int i;
 
-	if (!pdev->dev.of_node)
+	if (!dev->of_node)
 		return -ENODEV;
 
-	id = of_match_node(xadc_of_match_table, pdev->dev.of_node);
+	id = of_match_node(xadc_of_match_table, dev->of_node);
 	if (!id)
 		return -EINVAL;
 
@@ -1307,7 +1308,7 @@ static int xadc_probe(struct platform_device *pdev)
 	if (irq <= 0)
 		return -ENXIO;
 
-	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*xadc));
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*xadc));
 	if (!indio_dev)
 		return -ENOMEM;
 
@@ -1327,7 +1328,7 @@ static int xadc_probe(struct platform_device *pdev)
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &xadc_info;
 
-	ret = xadc_parse_dt(indio_dev, pdev->dev.of_node, &conf0);
+	ret = xadc_parse_dt(indio_dev, dev->of_node, &conf0);
 	if (ret)
 		return ret;
 
@@ -1351,7 +1352,7 @@ static int xadc_probe(struct platform_device *pdev)
 		}
 	}
 
-	xadc->clk = devm_clk_get(&pdev->dev, NULL);
+	xadc->clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(xadc->clk)) {
 		ret = PTR_ERR(xadc->clk);
 		goto err_free_samplerate_trigger;
@@ -1377,7 +1378,7 @@ static int xadc_probe(struct platform_device *pdev)
 	}
 
 	ret = request_irq(xadc->irq, xadc->ops->interrupt_handler, 0,
-			dev_name(&pdev->dev), indio_dev);
+			  dev_name(dev), indio_dev);
 	if (ret)
 		goto err_clk_disable_unprepare;