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Ticket6198: memwipe more address strings before freeing

Nick Mathewson requested to merge nickm/tor:ticket6198_035 into maint-0.3.5

This is a small patch for #6198 (closed), to memwipe a little more. It's a defense-in-depth thing. I'm marking it for possible backport, but I'm not sure whether that's a good idea.

Github PR to master at

After merging this, we could open a new ticket about refactoring more places in our code to use tor_str_wipe_and_free(), but IMO such a change should be master-only.

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