ALSA: hda - fix cs4210_spdif_automute()

Smatch complains that we have nested checks for "spdif_present".  It
turns out the current behavior isn't correct, we should remove the first
check and keep the second.

Fixes: 1077a024

 ('ALSA: hda - Use generic parser for Cirrus codec driver')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>