Fix potential security vulnerability in inffast (cloned from madler/zlib)

[Mifacopy]

This PR fixes a potential security vulnerability in inffast that was cloned from madler/zlib but did not receive the upstream security patch.

Details

• Affected File/Function: inffast in ext/zlib/inffast.c
• Original Fix: 9aaec95e8211
• Similarity to vulnerable code: 100.0%

What this PR does

Applies the same security patch that was applied to the original repository (madler/zlib) to eliminate the potential vulnerability in the cloned code.

References

• Original fix: madler/zlib@9aaec95

Please review and merge to protect this repository against the potential vulnerability.