We were just missing a check here to make sure orphaned files aren't
open in-device (these aren't really orphaned because we still have a
reference).
This can't happen during mount, but can happen if fixorphans is
triggered because of an orphaned/zombied file.
Also added a test over this case to prevent regression.
Actually the test was harder to implement than the fix.
Christopher Haster
3eaee6877c