Return the local varriable to delay the desctruction of the xml file #4016
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When we use migration option --xml or --persistent-xml, we need provide a existing xml file, but in _update_xmlfile_path_in_migrate_options() vmxml object is a local variable, it will be released after the _update_xmlfile_path_in_migrate_options() is done, so the xml file with vmxml object is released at the same time.
That will cause the migration fail. So return the local variable would delay the destruction after the migration.