rend_cache_decrement_allocation(): Bug: Underflow in rend_cache_decrement_allocation (On Windows build)

https://ci.appveyor.com/project/rl1987/tor/builds/20640384/job/3lk0nnv48m6vc5ni

rend_cache/clean: [forking] Nov 29 09:44:28.993 [warn] rend_cache_decrement_allocation(): Bug: Underflow in rend_cache_decrement_allocation (on Tor 0.4.0.0-alpha-dev 9c90bddc42467396)
OK

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