iio: adc: stm32-dfsdm: fix call to stop channel

stm32_dfsdm_stop_channel must be called with channel id, not filter id.

Fixes: e2e6771c ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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

@@ -464,7 +464,7 @@ static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc, bool dma)
 
 	regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id),
 			   DFSDM_CR1_RCONT_MASK, 0);
-	stm32_dfsdm_stop_channel(adc->dfsdm, adc->fl_id);
+	stm32_dfsdm_stop_channel(adc->dfsdm, adc->ch_id);
 
 	return ret;
 }