[libvirt] maint: backport of 736e017e and friends

[Martin Kletzander]

I wanted to back-port 736e017e as requested in Bug 1058149 [1],
because it fixes a crash.  However, it requires 5b3492fa and e9d09fe1
to be back-ported as well, so I wanted to confirm it's still OK when
it's not a simple two-liner or similar (and combined with the low
probability of the crash to happen).  What's the stand on this?

Martin

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1058149
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