[Libvir] also check for useless test-before-xmlFree

[Daniel Veillard]

On Tue, Apr 29, 2008 at 04:07:06PM +0200, Jim Meyering wrote:
> Some time ago, Daniel Veillard assured me that xmlFree(NULL) is
> valid in regular use, and with upstream code since January it's

  Yup it points to free() from libc, unless redefined by the
user, but I don't expect that in an application using libvirt.

  +1

Daniel

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