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During server teardown, mrootdraw is NULL, which can cause segfaults if
master->Stop{,Flipping}PixmapTracking() don't do NULL checking. In this case we
shouldn't need to do master->Stop{,Flipping}PixmapTracking() anyway, so just
skip it.
Signed-off-by: Alex Goins <agoins@nvidia.com>
(cherry picked from commit c82f814313)