iio: adc: ad_sigma_delta: Add error checking for ad_sigma_delta_set_channel()

All other calls to ad_sigma_delta_set_channel() in ad_sigma_delta.c
check the return value afterwards. Do it for all calls.

Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

Author: ukleinek

drivers/iio/adc/ad_sigma_delta.c

@@ -390,7 +390,9 @@ int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
 	if (!iio_device_claim_direct(indio_dev))
 		return -EBUSY;
 
-	ad_sigma_delta_set_channel(sigma_delta, chan->address);
+	ret = ad_sigma_delta_set_channel(sigma_delta, chan->address);
+	if (ret)
+		goto out_release;
 
 	spi_bus_lock(sigma_delta->spi->controller);
 	sigma_delta->bus_locked = true;
@@ -431,6 +433,7 @@ int ad_sigma_delta_single_conversion(struct iio_dev *indio_dev,
 	sigma_delta->keep_cs_asserted = false;
 	sigma_delta->bus_locked = false;
 	spi_bus_unlock(sigma_delta->spi->controller);
+out_release:
 	iio_device_release_direct(indio_dev);
 
 	if (ret)