[cairo] [PATCH] Always call _cairo_region_get_boxes with an initialized 'boxes' pointer

[Argiris Kirtzidis]

Hi all,

Code that calls _cairo_region_get_boxes will later call 
_cairo_region_boxes_fini to free the 'boxes' pointer;
here's a patch to initialize the pointer to NULL to avoid free'ing an 
uninitialized pointer.

-Argiris
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