[RFC PATCH asoc] IIO: ADC: stm32_dfsdm_stop_filter() can be static

[kbuild test robot]

Fixes: e2e6771c6462 ("IIO: ADC: add STM32 DFSDM sigma delta ADC support")
Signed-off-by: Fengguang Wu <fengguang.wu at intel.com>
---
 stm32-dfsdm-adc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index b03ca3f..e628d04 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -254,7 +254,7 @@ static int stm32_dfsdm_start_filter(struct stm32_dfsdm *dfsdm,
 				  DFSDM_CR1_RSWSTART(1));
 }
 
-void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm, unsigned int fl_id)
+static void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm, unsigned int fl_id)
 {
 	/* Disable conversion */
 	regmap_update_bits(dfsdm->regmap, DFSDM_CR1(fl_id),
@@ -296,9 +296,9 @@ static int stm32_dfsdm_filter_configure(struct stm32_dfsdm *dfsdm,
 				  DFSDM_CR1_RSYNC(fl->sync_mode));
 }
 
-int stm32_dfsdm_channel_parse_of(struct stm32_dfsdm *dfsdm,
-				 struct iio_dev *indio_dev,
-				 struct iio_chan_spec *ch)
+static int stm32_dfsdm_channel_parse_of(struct stm32_dfsdm *dfsdm,
+					struct iio_dev *indio_dev,
+					struct iio_chan_spec *ch)
 {
 	struct stm32_dfsdm_channel *df_ch;
 	const char *of_str;