qemu: Allocate diskPriv->blockjob only when there's a blockjob
Rather than storing the presence of the blockjob in a flag we can bind together the lifecycle of the job with the lifecycle of the object which is tracking the data for it. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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