wdcdetach
if ((error = wdcdetach(chp, flags)) != 0)
int wdcdetach(struct channel_softc *, int);
wdcdetach(
int wdcdetach(struct channel_softc *, int);
wdcdetach(wdc_cp, flags);
if ((error = wdcdetach(&sc->wdc_channel, flags)) != 0)