qemu_hotplug: Assume chardev alias always exists in qemuDomainDetachChrDevice
The @tmpChr is looked up in domain definition based on user provided chardev XML. Therefore, the alias must have been allocated already when domain was started up. Signed-off-by: NMichal Privoznik <mprivozn@redhat.com> Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
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