iio: adc: meson_saradc: Use devm_clk_get_optional()

Replace open coded variants of devm_clk_get_optional().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20220603100004.70336-4-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/meson_saradc.c

@@ -1222,23 +1222,13 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->core_clk),
 				     "failed to get core clk\n");
 
-	priv->adc_clk = devm_clk_get(&pdev->dev, "adc_clk");
-	if (IS_ERR(priv->adc_clk)) {
-		if (PTR_ERR(priv->adc_clk) == -ENOENT)
-			priv->adc_clk = NULL;
-		else
-			return dev_err_probe(&pdev->dev, PTR_ERR(priv->adc_clk),
-					     "failed to get adc clk\n");
-	}
+	priv->adc_clk = devm_clk_get_optional(dev, "adc_clk");
+	if (IS_ERR(priv->adc_clk))
+		return dev_err_probe(dev, PTR_ERR(priv->adc_clk), "failed to get adc clk\n");
 
-	priv->adc_sel_clk = devm_clk_get(&pdev->dev, "adc_sel");
-	if (IS_ERR(priv->adc_sel_clk)) {
-		if (PTR_ERR(priv->adc_sel_clk) == -ENOENT)
-			priv->adc_sel_clk = NULL;
-		else
-			return dev_err_probe(&pdev->dev, PTR_ERR(priv->adc_sel_clk),
-					     "failed to get adc_sel clk\n");
-	}
+	priv->adc_sel_clk = devm_clk_get_optional(dev, "adc_sel");
+	if (IS_ERR(priv->adc_sel_clk))
+		return dev_err_probe(dev, PTR_ERR(priv->adc_sel_clk), "failed to get adc_sel clk\n");
 
 	/* on pre-GXBB SoCs the SAR ADC itself provides the ADC clock: */
 	if (!priv->adc_clk) {