iio: adc: stm32-dfsdm: fix single conversion

Apply data formatting to single conversion,
as this is already done in continuous and trigger modes.

Fixes: 102afde ("iio: adc: stm32-dfsdm: manage data resolution in trigger mode")

Change-Id: Ief3dd068cf9eb95afa864bbde9e2c46629137f99
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/142921
Reviewed-by: Fabrice GASNIER <fabrice.gasnier@st.com>

Author: omn29

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

@@ -1204,6 +1204,8 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev,
 
 	stm32_dfsdm_stop_conv(adc);
 
+	stm32_dfsdm_process_data(adc, res);
+
 stop_dfsdm:
 	stm32_dfsdm_stop_dfsdm(adc->dfsdm);