ASoC: soc-ops: fix error handling

ASoC: soc-ops: fix error handling

cppcheck throws the following warning:

sound/soc/soc-ops.c:461:8: style: Variable 'ret' is assigned a value
that is never used. [unreadVariable]
   ret = err;
       ^

This seems to be a missing change in the return value.

Fixes: 7f3d90a351968 ("ASoC: ops: Fix stereo change notifications in snd_soc_put_volsw_sx()")
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220421162328.302017-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>