[asoc:topic/iio 9/11] drivers/iio/adc/stm32-dfsdm-adc.c:241:6: sparse: symbol 'stm32_dfsdm_stop_filter' was not declared. Should it be static?

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git topic/iio
head:   16cbca06fa8288a4f58426fc898b141e12ee8008
commit: e2e6771c646251657fafb2a78db566d5c2c70635 [9/11] IIO: ADC: add STM32 DFSDM sigma delta ADC support
reproduce:
        # apt-get install sparse
        git checkout e2e6771c646251657fafb2a78db566d5c2c70635
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/iio/adc/stm32-dfsdm-adc.c:241:6: sparse: symbol 'stm32_dfsdm_stop_filter' was not declared. Should it be
>> drivers/iio/adc/stm32-dfsdm-adc.c:283:5: sparse: symbol 'stm32_dfsdm_channel_parse_of' was not declared. Should it be

Please review and possibly fold the followup patch.

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