commit 522a7fa8 upstream.

Alsa-info at https://launchpadlibrarian.net/186697318/alsa-info.txt.37fYWkaJRcReported-by: Tomas Nilsson <tomas.k.nilsson@gmail.com>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>