qemu: domain: Prepare qemuDomainDiskGetBackendAlias for -blockdev
Pass in the node name as the backend alias when -blockdev is used. As copy-on-read is expressed by a separate -blockdev backing chain member we need to decide which node name to use here. For empty cdroms when using -blockdev there is no backend at all so NULL is returned. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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