Similarly to other libvirt object freeing APIs the function resets the
libvirt error when called and doesn't take NULL gracefully. Install the
workaround and g_autoptr handlers similarly to the 'virshDomain' type.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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