ASoC: tas2562: Propagate the error in tas2562_dac_event()

ASoC: tas2562: Propagate the error in tas2562_dac_event()

Since commit 4a008c8369d1 ("ASoC: tas2562: Fix mute/unmute") the
following build warning is seen:

sound/soc/codecs/tas2562.c:442:13: warning: variable 'ret' set but not used [-Wunused-but-set-variable]

Fix the warning by returning the 'ret' variable.

Fixes: 4a008c8369d1 ("ASoC: tas2562: Fix mute/unmute")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220913231706.516849-1-festevam@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>