qemu: hotplug: Use 'tlsAlias' to see whether to detach the disk

Using 'haveTLS' to do this is pointless if the alias is not set.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_hotplug.c

@@ -3958,7 +3958,7 @@ qemuDomainRemoveDiskDevice(virQEMUDriverPtr driver,
         !virStoragePRDefIsManaged(disk->src->pr))
         ignore_value(qemuMonitorDelObject(priv->mon, disk->src->pr->mgralias));
 
-    if (disk->src->haveTLS)
+    if (disk->src->tlsAlias)
         ignore_value(qemuMonitorDelObject(priv->mon, disk->src->tlsAlias));
 
     if (prManaged && !prUsed)