ASoC: codecs: cs42l42-sdw: clear stream

The API requires the stream info to be cleared when the argument is
NULL.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230324014408.1677505-2-yung-chuan.liao@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>