iio: adc: rockchip_saradc: Use dev_err_probe

Use dev_err_probe instead of dev_err in probe function,
which simplifies code a little bit and prints the error
code.

Signed-off-by: Shreeya Patel <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/rockchip_saradc.c

···
 		return -ENODEV;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
-	if (!indio_dev) {
-		dev_err(&pdev->dev, "failed allocating iio device\n");
-		return -ENOMEM;
-	}
+	if (!indio_dev)
+		return dev_err_probe(&pdev->dev, -ENOMEM,
+				     "failed allocating iio device\n");
+
 	info = iio_priv(indio_dev);
 
 	match_data = of_device_get_match_data(&pdev->dev);
-	if (!match_data) {
-		dev_err(&pdev->dev, "failed to match device\n");
-		return -ENODEV;
-	}
+	if (!match_data)
+		return dev_err_probe(&pdev->dev, -ENODEV,
+				     "failed to match device\n");
 
 	info->data = match_data;
 
 	/* Sanity check for possible later IP variants with more channels */
-	if (info->data->num_channels > SARADC_MAX_CHANNELS) {
-		dev_err(&pdev->dev, "max channels exceeded");
-		return -EINVAL;
-	}
+	if (info->data->num_channels > SARADC_MAX_CHANNELS)
+		return dev_err_probe(&pdev->dev, -EINVAL,
+				     "max channels exceeded");
 
 	info->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(info->regs))
···
 	 * This may become user-configurable in the future.
 	 */
 	ret = clk_set_rate(info->clk, info->data->clk_rate);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to set adc clk rate, %d\n", ret);
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to set adc clk rate\n");
 
 	ret = regulator_enable(info->vref);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to enable vref regulator\n");
-		return ret;
-	}
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to enable vref regulator\n");
+
 	ret = devm_add_action_or_reset(&pdev->dev,
 				       rockchip_saradc_regulator_disable, info);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register devm action, %d\n",
-			ret);
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to register devm action\n");
 
 	ret = regulator_get_voltage(info->vref);
 	if (ret < 0)