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Alan Coopersmith authored
While these are mostly called during teardown of larger structures that are about to themselves be freed, there's no guarantee that will always be the case, so try to be safer here. [ This bug was found by the Parfait 4.0 bug checking tool. http://labs.oracle.com/pls/apex/f?p=labs:49:::::P49_PROJECT_ID:13 ] v2: Deduplicate & simplify pointer clearing in _XFreeEventCookies as suggested by @keithp Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>