Ryan Liptak 0779e847f7 Skip empty/invalid records/certs in MacOS keychain files
In the original PR that implemented this (https://github.com/ziglang/zig/pull/14325), it included a list of references for the keychain format. Multiple of those references include the checks that are added in this commit, and empirically this fixes the loading of a real keychain file that was previously failing (it had both a record with offset 0 and a record with cert_size 0).

Fixes #22870
2025-02-18 09:01:10 +01:00
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