qemu: hotplug: Transfer ownership of backing chain to block job on disk unplug
When removing the disk fronted while any block job is still active we need to transfer the ownership of the backing chain to the job itself as the job still holds the reference to the chain members and thus attempts to remove them would fail.
Signed-off-by: Peter Krempa <pkrempa redhat com> Reviewed-by: Ján Tomko <jtomko redhat com>
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