On normal exit, we remove any loopback devices that were created, but if it's necessary to SIGKILL/SIGQUIT nDAX, the devices are left behind. We should do one or more of
Clean up any module-null-sink matching our source/sink name if they exist on startup
Just use the existing ones if they already exist on startup
Have a command that does nothing except cleanup, for users' convenience.
On normal exit, we remove any loopback devices that were created, but if it's necessary to SIGKILL/SIGQUIT nDAX, the devices are left behind. We should do one or more of
module-null-sinkmatching our source/sink name if they exist on startup