[PATCH -next] IIO: ADC: fix return value check in stm32_dfsdm_adc_probe()

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In case of error, the function devm_iio_device_alloc() returns NULL
pointer not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: e2e6771c6462 ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 drivers/iio/adc/stm32-dfsdm-adc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index e628d04..5e87140 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -1100,9 +1100,9 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
 	dev_data = (const struct stm32_dfsdm_dev_data *)of_id->data;
 
 	iio = devm_iio_device_alloc(dev, sizeof(*adc));
-	if (IS_ERR(iio)) {
+	if (!iio) {
 		dev_err(dev, "%s: Failed to allocate IIO\n", __func__);
-		return PTR_ERR(iio);
+		return -ENOMEM;
 	}
 
 	adc = iio_priv(iio);

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