qemu: Avoid using stale data in virDomainGetBlockInfo
CVE-2013-6458 Generally, every API that is going to begin a job should do that before fetching data from vm->def. However, qemuDomainGetBlockInfo does not know whether it will have to start a job or not before checking vm->def. To avoid using disk alias that might have been freed while we were waiting for a job, we use its copy. In case the disk was removed in the meantime, we will fail with "cannot find statistics for device '...'" error message. (cherry picked from commit b7992595)
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