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The following fix will use the refactored function.
The logic in the refactored function is slightly simplified, exploiting
the fact that this function is only ever called with a valid flip
pixmap.
v2: Assert that flip_pixmap is non-NULL instead of testing and bailing
on NULL, preserve test for flip_window being non-NULL before calling
present_set_tree_pixmap for it (Keith Packard)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v1)
Reviewed-by: Keith Packard <keithp@keithp.com>