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Merged
Created Mar 08, 2019 by Michel Dänzer@daenzerMaintainer

xwayland/present: Destroy sync_callback in xwl_present_cleanup

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xwl_present_cleanup frees the struct xwl_present_window memory, so if there's a pending callback, we have to destroy it to prevent use-after-free in xwl_present_sync_callback.

Should fix issue #645 (closed).

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Source branch: xwl_present_cleanup-sync_callback