MFC rev. 1.431: Remove union_dircheckp hook, it is not needed by new unionfs code anymore. As consequence, getdirentries() no longer needs to drop/reacquire directory vnode lock, that would allow it to be reclaimed in between.
MFC rev. 1.431:
Remove union_dircheckp hook, it is not needed by new unionfs code anymore.
As consequence, getdirentries() no longer needs to drop/reacquire
directory vnode lock, that would allow it to be reclaimed in between.

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