Fix edge cases of uncompressed size check

[0f-0b]

This PR fixes two issues with the recently introduced uncompressed size check.

• In passthrough mode, the check would incorrectly fail if the compressed size is larger than the uncompressed size.
• When reading an entry with the uncompressed size set to 0 in a malicious zip file, the check is only done after rather than during decompression, which may lead to excessive resource usage.

[gildas-lormeau]

Thank you very much! It's fixed in the version 2.8.2 I've just deployed.