ALSA: hda: cirrus_scodec: fix an error code

The "ret" variable is zero but we should return -EINVAL.

Fixes: 2144833e ("ALSA: hda: cirrus_scodec: Add KUnit test")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/5eea7fd5-67c8-4ed4-b5b3-b85dfb7572cc@moroto.mountain


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