Move decision whether to make a new hash table or not to be after

the open().  That way if the user opened with O_EXLOCK and another
process has the .db locked we don't decide to zero hash before
the locking process has had a chance to write to the database.
This also makes the logic simpler since we can just fstat the fd
and check for size == 0 && !O_RDONLY.  Closes PR 1934.

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