iio: dac: lpc18xx_dac: Make use of the helper function dev_err_probe()

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Link: https://lore.kernel.org/r/20210928013902.1341-2-caihuoqing@baidu.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/lpc18xx_dac.c

@@ -121,16 +121,14 @@ static int lpc18xx_dac_probe(struct platform_device *pdev)
 		return PTR_ERR(dac->base);
 
 	dac->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dac->clk)) {
-		dev_err(&pdev->dev, "error getting clock\n");
-		return PTR_ERR(dac->clk);
-	}
+	if (IS_ERR(dac->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dac->clk),
+				     "error getting clock\n");
 
 	dac->vref = devm_regulator_get(&pdev->dev, "vref");
-	if (IS_ERR(dac->vref)) {
-		dev_err(&pdev->dev, "error getting regulator\n");
-		return PTR_ERR(dac->vref);
-	}
+	if (IS_ERR(dac->vref))
+		return dev_err_probe(&pdev->dev, PTR_ERR(dac->vref),
+				     "error getting regulator\n");
 
 	indio_dev->name = dev_name(&pdev->dev);
 	indio_dev->info = &lpc18xx_dac_info;