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Limit the number of elements in a consdiff hash line.

Nick Mathewson requested to merge nickm/tor:bug40472_case1_035 into maint-0.3.5

This avoids performing and then freeing a lot of small mallocs() if the hash line has too many elements.

Fixes one case of bug #40472 (closed); resolves OSS-Fuzz 38363. Bugfix on when the consdiff parsing code was introduced.

I'm opening this fix against 0.3.5, but I do think it's safe not to backport it.

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