mscp_decodeerror
if (mscp_decodeerror(usc == NULL?"unconf disk" : device_xname(usc), mp, mi))
if (mscp_decodeerror(usc == NULL?"unconf mt" : device_xname(usc), mp, mi))
int mscp_decodeerror(const char *, struct mscp *, struct mscp_softc *);