Bug#34588: dpkg: wrong error message with bad --compare-versions command

[Julian Gilbey <J.D.Gilbey@qmw.ac.uk>]

Package: dpkg
Version: 1.4.0.34

$ dpkg --compare-versions 2.1 lt
dpkg: --cmpversions takes three arguments: <version> <relation> <version>

...

This should obviously say:
dpkg: --compare-versions takes ...

   Julian

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  Julian Gilbey, Dept of Maths, QMW, Univ. of London. J.D.Gilbey@qmw.ac.uk
             Debian GNU/Linux Developer.  jdg@debian.org
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