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only caller, and delete.
(vc-hg-state): Deal with exceptions and only parse the output on
successful return.

* vc-hg.el (vc-hg-internal-log): Inline in
`vc-hg-workfile-version', the only caller, and delete.
(vc-hg-workfile-version): Deal with exceptions and only parse the
output on successful return.