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+ o Minor fixes (security):
+ - Make memwipe() do nothing when passed a NULL pointer
+ or zero size. Check size argument to memwipe() for underflow.
+ Closes bug #18089. Reported by "gk", patch by "teor".
+ Bugfix on 0.2.3.25 and 0.2.4.6-alpha (#7352),
+ commit 49dd5ef3 on 7 Nov 2012.