DEVINFO_CHILD
data.di_flags = DEVINFO_PARENT | DEVINFO_CHILD;
'p', MDB_OPT_CLRBITS, DEVINFO_CHILD, &data.di_flags,
if ((data.di_flags & (DEVINFO_PARENT | DEVINFO_CHILD)) ==
(DEVINFO_PARENT | DEVINFO_CHILD)) {
} else if (data.di_flags & DEVINFO_CHILD) {
data.di_flags |= DEVINFO_PARENT | DEVINFO_CHILD;