dev/sound/pcm/* patch testers wanted

[Cameron Grant]

> I cleaned up the channel locking code, but there are still issues with
> the usage of pcm_lock() that have not been addressed.
[...]
> Please let me know if you get the "Danger!" diagnostic message.

i really appreciate you doing this.  i feel quite guilty about not having 
done it myself, but life really isn't giving me a chance just now.

thanks,
	-cg