So that permanently broke sound for you and rebooting doesn't fix it? What happens when you try unmuting everything in alsamixer? Your dmesg might have information about sound. I recently used it to find out that a kernel update rendered my sound card dependent on the alsa-firmware package.
This message also prints when you first start up right? Does it finish and go away then? It seems like this is a bug in initscripts. You can try reporting it, but the devs might just say to use systemd.