iio: adc: meson_saradc: Convert to use dev_err_probe()

It's fine to call dev_err_probe() in ->probe() when error code is known.
Convert the driver to use dev_err_probe().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20220603100004.70336-3-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/meson_saradc.c

@@ -698,6 +698,7 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 	u8 *buf, trimming_bits, trimming_mask, upper_adc_val;
+	struct device *dev = indio_dev->dev.parent;
 	struct nvmem_cell *temperature_calib;
 	size_t read_len;
 	int ret;
@@ -714,30 +715,23 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 		if (ret == -ENODEV)
 			return 0;
 
-		return dev_err_probe(indio_dev->dev.parent, ret,
-				     "failed to get temperature_calib cell\n");
+		return dev_err_probe(dev, ret, "failed to get temperature_calib cell\n");
 	}
 
 	priv->tsc_regmap =
 		syscon_regmap_lookup_by_phandle(indio_dev->dev.parent->of_node,
 						"amlogic,hhi-sysctrl");
-	if (IS_ERR(priv->tsc_regmap)) {
-		dev_err(indio_dev->dev.parent,
-			"failed to get amlogic,hhi-sysctrl regmap\n");
-		return PTR_ERR(priv->tsc_regmap);
-	}
+	if (IS_ERR(priv->tsc_regmap))
+		return dev_err_probe(dev, PTR_ERR(priv->tsc_regmap),
+				     "failed to get amlogic,hhi-sysctrl regmap\n");
 
 	read_len = MESON_SAR_ADC_EFUSE_BYTES;
 	buf = nvmem_cell_read(temperature_calib, &read_len);
-	if (IS_ERR(buf)) {
-		dev_err(indio_dev->dev.parent,
-			"failed to read temperature_calib cell\n");
-		return PTR_ERR(buf);
-	} else if (read_len != MESON_SAR_ADC_EFUSE_BYTES) {
+	if (IS_ERR(buf))
+		return dev_err_probe(dev, PTR_ERR(buf), "failed to read temperature_calib cell\n");
+	if (read_len != MESON_SAR_ADC_EFUSE_BYTES) {
 		kfree(buf);
-		dev_err(indio_dev->dev.parent,
-			"invalid read size of temperature_calib cell\n");
-		return -EINVAL;
+		return dev_err_probe(dev, -EINVAL, "invalid read size of temperature_calib cell\n");
 	}
 
 	trimming_bits = priv->param->temperature_trimming_bits;
@@ -762,6 +756,7 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 static int meson_sar_adc_init(struct iio_dev *indio_dev)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
+	struct device *dev = indio_dev->dev.parent;
 	int regval, i, ret;
 
 	/*
@@ -885,18 +880,12 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev)
 	}
 
 	ret = clk_set_parent(priv->adc_sel_clk, priv->clkin);
-	if (ret) {
-		dev_err(indio_dev->dev.parent,
-			"failed to set adc parent to clkin\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to set adc parent to clkin\n");
 
 	ret = clk_set_rate(priv->adc_clk, priv->param->clock_rate);
-	if (ret) {
-		dev_err(indio_dev->dev.parent,
-			"failed to set adc clock rate\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to set adc clock rate\n");
 
 	return 0;
 }
@@ -1183,24 +1172,21 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
 {
 	const struct meson_sar_adc_data *match_data;
 	struct meson_sar_adc_priv *priv;
+	struct device *dev = &pdev->dev;
 	struct iio_dev *indio_dev;
 	void __iomem *base;
 	int irq, ret;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
-	if (!indio_dev) {
-		dev_err(&pdev->dev, "failed allocating iio device\n");
-		return -ENOMEM;
-	}
+	if (!indio_dev)
+		return dev_err_probe(dev, -ENOMEM, "failed allocating iio device\n");
 
 	priv = iio_priv(indio_dev);
 	init_completion(&priv->done);
 
 	match_data = of_device_get_match_data(&pdev->dev);
-	if (!match_data) {
-		dev_err(&pdev->dev, "failed to get match data\n");
-		return -ENODEV;
-	}
+	if (!match_data)
+		return dev_err_probe(dev, -ENODEV, "failed to get match data\n");
 
 	priv->param = match_data->param;