iio: adc: meson_saradc: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and also it prints the error value.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20200829064726.26268-6-krzk@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/meson_saradc.c

@@ -719,11 +719,8 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 		if (ret == -ENODEV)
 			return 0;
 
-		if (ret != -EPROBE_DEFER)
-			dev_err(indio_dev->dev.parent,
+		return dev_err_probe(indio_dev->dev.parent, ret,
 				     "failed to get temperature_calib cell\n");
-
-		return ret;
 	}
 
 	priv->tsc_regmap =