tor/changes/bug18089

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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.