dac00073ba
ftdi/usbaudiod scheme.rs updated to match acmd/ecmd pattern: Explicit match arms in read/write (not map/map_err chains) Consistent openat with root dir + device file routing Saturating close count AudioScheme retains capture/playback path routing All 4 scheme modules now identical in structure: acmd → /scheme/ttys/usbACM_<N> (Mutex<bulk_in>, Mutex<bulk_out>) ftdi → /scheme/ttys/usbFTDI_<N> (same) ecmd → /scheme/net/usbECM_<N> (same) audio → /scheme/audio/usbAudio_<N> (Mutex<isoch_in>, Mutex<Option<isoch_out>>)