crypto: Switch to QEMU UUID API
The uuid generation doesn't return error, so update the function signature and calling code accordingly. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Message-Id: <1474432046-325-7-git-send-email-famz@redhat.com> Reviewed-by: NDaniel P. Berrange <berrange@redhat.com>
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