[Libvir] Patch: Fix documentation and code of virGetDomain function

It turns out that you _can't_ pass name=NULL to virGetDomain, despite what the docs say. Rich. -- Emerging Technologies, Red Hat http://et.redhat.com/~rjones/ 64 Baker Street, London, W1U 7DF Mobile: +44 7866 314 421 "[Negative numbers] darken the very whole doctrines of the equations and make dark of the things which are in their nature excessively obvious and simple" (Francis Maseres FRS, mathematician, 1759)