iio: adc: stm32-adc: don't print an error on probe deferral

Do not print an error trace when deferring probe for some resource.
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/stm32-adc-core.c

@@ -688,6 +688,7 @@ static int stm32_adc_probe(struct platform_device *pdev)
 	priv->vref = devm_regulator_get(&pdev->dev, "vref");
 	if (IS_ERR(priv->vref)) {
 		ret = PTR_ERR(priv->vref);
+		if (ret != -EPROBE_DEFER)
 			dev_err(&pdev->dev, "vref get failed, %d\n", ret);
 		return ret;
 	}
@@ -696,6 +697,7 @@ static int stm32_adc_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->aclk)) {
 		ret = PTR_ERR(priv->aclk);
 		if (ret != -ENOENT) {
+			if (ret != -EPROBE_DEFER)
 				dev_err(&pdev->dev, "Can't get 'adc' clock\n");
 			return ret;
 		}
@@ -706,6 +708,7 @@ static int stm32_adc_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->bclk)) {
 		ret = PTR_ERR(priv->bclk);
 		if (ret != -ENOENT) {
+			if (ret != -EPROBE_DEFER)
 				dev_err(&pdev->dev, "Can't get 'bus' clock\n");
 			return ret;
 		}