da61381 Check return status for virUUIDGenerate

Authored and Committed by John Ferlan 5 years ago
    Check return status for virUUIDGenerate
    
    Although legal, a few paths were not checking a return value < 0
    for failure instead they checked a non zero failure.
    
    Clean them all up to be consistent.
    
    Signed-off-by: John Ferlan <jferlan@redhat.com>
    
        
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