savevm: qmp_xen_save_devices_state(): use error_setg_file_open()
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Acked-by: NKevin Wolf <kwolf@redhat.com>
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Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Acked-by: NKevin Wolf <kwolf@redhat.com>