iio: ep93xx: Remove redundant error printing in ep93xx_adc_probe()

When devm_ioremap_resource() fails, a clear enough error message will be
printed by its subfunction __devm_ioremap_resource(). The error
information contains the device name, failure cause, and possibly resource
information.

Therefore, remove the error printing here to simplify code and reduce the
binary size.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ep93xx_adc.c

@@ -165,10 +165,8 @@ static int ep93xx_adc_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(priv->base)) {
-		dev_err(&pdev->dev, "Cannot map memory resource\n");
+	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
-	}
 
 	iiodev->name = dev_name(&pdev->dev);
 	iiodev->modes = INDIO_DIRECT_MODE;