ALSA: hda/hdmi: remove redundant assignment to variable pcm_idx

Variable pcm_idx is being initialized with a value that is never read
and is being re-assigned immediately afterwards. The assignment is
redundant and hence can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190905154826.5916-1-colin.king@canonical.com


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