When the system has only the headphone and the line-out jacks without
speakers, the current auto-mute code doesn't work.  It's because the
spec->automute_lines flag is wrongly referred in update_speakers().
This flag must be meaningless when spec->automute_hp_lo isn't set, thus
they should be always coupled.

The patch fixes the problem and add a comment to indicate the
relationship briefly.

BugLink: http://bugs.launchpad.net/bugs/851697Reported-by: NDavid Henningsson <david.henningsson@canonical.com>
Tested-By: NJayne Han <jayne.han@canonical.com>
Cc: stable@kernel.org (3.0)
Signed-off-by: NTakashi Iwai <tiwai@suse.de>