assert failed: sc->sc_parent->dk_rawopens > NUM

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

#syz fix: dk(4): Use disk_begindetach and rely on vdevgone to close instances.

Not sure exactly which commit fixed it, but this or the next one,
`dk(4): Set .d_cfdriver and .d_devtounit to plug open/detach race.',
are the best candidates, without having bisected to find the exact one
-- also some commits along the way broke and fixed some other things
so pinpointing the commit that fixed _this_ issue might be tricky.  In
any case, pretty sure it's fixed along with a slew of other locking
bugs and invariant violations.

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