audiounit: Avoid some manual allocations split across audiounit_enumerate_devices/audiounit_get_devices.
audiounit: Avoid some manual allocations split across audiounit_enumerate_devices/audiounit_get_devices.

padenot/cubeb,padenot/cubeb,kinetiknz/cubeb,kinetiknz/cubeb,padenot/cubeb,kinetiknz/cubeb