Be sure to always flush a stuck pageflip even if we couldn't possibly
expect one to be there.

References: https://bugs.freedesktop.org/show_bug.cgi?id=82612Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>