Fix probing of QED file format
The QED file format is non-versioned, so although the magic
value matched, libvirt rejected it due to lack of a version
number to compare against. We need to distinguish this case
by allowing a value of '-2' to indicate a non-versioned file
where only the magic is required to match
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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