Mateusz Guzik eb88fed446 cache: fix vexec panic when racing against vgone
Use of dead_vnodeops would result in a panic instead of returning the intended
EOPNOTSUPP error.

While here make sure to abort, not just try to return a partial result.
The former allows the regular lookup to restart from scratch, while the latter
makes it stuck with an unusable vnode.

Reported by:	kevans
2020-10-09 19:10:00 +00:00
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