iio: adc: exynos: Silence warning about regulators during deferred probe

Don't confuse user with meaningless warning about the failure in getting
regulators in case of deferred probe.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/exynos_adc.c

@@ -836,7 +836,9 @@ static int exynos_adc_probe(struct platform_device *pdev)
 
 	info->vdd = devm_regulator_get(&pdev->dev, "vdd");
 	if (IS_ERR(info->vdd)) {
-		dev_err(&pdev->dev, "failed getting regulator, err = %ld\n",
+		if (PTR_ERR(info->vdd) != -EPROBE_DEFER)
+			dev_err(&pdev->dev,
+				"failed getting regulator, err = %ld\n",
 				PTR_ERR(info->vdd));
 		return PTR_ERR(info->vdd);
 	}