modesetting: fix memory leak caused by TearFree
When compositing in Xorg, dirty->data is marked, RegionIntersect() wil1allocate space for the region to save dirty->data, afterwards the regionneeds to be released.
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When compositing in Xorg, dirty->data is marked, RegionIntersect() wil1allocate space for the region to save dirty->data, afterwards the regionneeds to be released.