ALSA: hda/ca0132 - Clean up patch_ca0132()

This patch cleans up the patch_ca0132() function with suggestions from
Takashi Sakamoto.

Signed-off-by: Connor McAdams <conmanx360@gmail.com>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>