ALSA: aica: Remove unused variable

The variable is never referenced in the code, just remove it

Signed-off-by: Zhu Jun <zhujun2@cmss.chinamobile.com>
Link: https://patch.msgid.link/20241008061357.12042-1-zhujun2@cmss.chinamobile.com


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