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2016-01-18Make memwipe() do nothing when passed a NULL pointer or zero sizeteor (Tim Wilson-Brown)
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.