ALSA: intel8x0: Fix incorrect codec index usage in mixer for ICH4

code mistakenly used a hardcoded index (codec[1]) instead of
iterating, over the codec array using the loop variable i.
Use codec[i] instead of codec[1] to match the loop iteration.

Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Link: https://patch.msgid.link/20250621185233.4081094-1-alok.a.tiwari@oracle.com


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