ASoC: cs4270: fix kernel-doc

Add missing parameter (which happens to be ignored)
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302205926.49063-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs4270.c

@@ -400,6 +400,7 @@ static int cs4270_hw_params(struct snd_pcm_substream *substream,
  * cs4270_dai_mute - enable/disable the CS4270 external mute
  * @dai: the SOC DAI
  * @mute: 0 = disable mute, 1 = enable mute
+ * @direction: (ignored)
  *
  * This function toggles the mute bits in the MUTE register.  The CS4270's
  * mute capability is intended for external muting circuitry, so if the