iio: adc: stm32-dfsdm: missing error case during probe

[ Upstream commit d2fc0156963cae8f1eec8e2dd645fbbf1e1c1c8e ]

During probe, check the devm_ioremap_resource() error value.
Also return the devm_clk_get() error value instead of -EINVAL.
Signed-off-by: NFabien Dessenne <fabien.dessenne@st.com>
Acked-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>

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

@@ -213,6 +213,8 @@ static int stm32_dfsdm_parse_of(struct platform_device *pdev,
 	}
 	priv->dfsdm.phys_base = res->start;
 	priv->dfsdm.base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(priv->dfsdm.base))
+		return PTR_ERR(priv->dfsdm.base);
 
 	/*
 	 * "dfsdm" clock is mandatory for DFSDM peripheral clocking.
@@ -222,8 +224,10 @@ static int stm32_dfsdm_parse_of(struct platform_device *pdev,
 	 */
 	priv->clk = devm_clk_get(&pdev->dev, "dfsdm");
 	if (IS_ERR(priv->clk)) {
-		dev_err(&pdev->dev, "No stm32_dfsdm_clk clock found\n");
-		return -EINVAL;
+		ret = PTR_ERR(priv->clk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get clock (%d)\n", ret);
+		return ret;
 	}
 
 	priv->aclk = devm_clk_get(&pdev->dev, "audio");