ALSA: hda: cs35l41: Do not allow uninitialised variables to be freed

Initialise the variables to NULL so that they cannot be uninitialised
when devm_kfree is called.

Found by static analysis.

Fixes: 8c4c216d ("ALSA: hda: cs35l41: Add config table to support many laptops without _DSD")

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20231219162232.790358-2-sbinding@opensource.cirrus.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>