Comment # 4 on bug 1041201 from Reinhard Max

Bisecting zlib reveals that this was the change that breaks the ClamAV
testsuite:

https://github.com/madler/zlib/commit/b516b4bdd7c0c9f0858adfebf732089014f7b282

Dunno if this commit actually broke zlib or if ClamAV just depends on
broken/undefined behaviour of zlib here.

Tom����, can you make any sense of this from the zlib side?

If not, I'll report this to ClamAV upstream.