xen/time: Return -ENODEV from xen_get_wallclock()
For any other error sync_cmos_clock() will reschedule itself every second or so, for no good reason. Suggested-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
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