[Libvir] PATCH: BZ 427107: fix crash wrt auth callback

[Richard W.M. Jones]

Daniel P. Berrange wrote:
> If the application does not supply an authentication callback, and tries to
> connect to a server with PolicyKit auth turned on it will try to deference
> a NULL pointer with predictably crashtastic results:

+1 looks sane to me.

Rich.

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