Fix OCSP timebomb in tests

[samuel40791765]

Issues:

Resolves #1889

It turns out the first call to OCSP_check_validity in TestGoodOCSP will emit two additional errors on to the error stack once the "this update" field is outdated. Clearing the previous additional errors on the stack allows us to check for which specific errors were emitted more accurately.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.46%. Comparing base (36e0307) to head (7bfa580).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1891      +/-   ##
==========================================
- Coverage   78.50%   78.46%   -0.05%     
==========================================
  Files         585      585              
  Lines       99516    99518       +2     
  Branches    14244    14243       -1     
==========================================
- Hits        78122    78083      -39     
- Misses      20759    20799      +40     
- Partials      635      636       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.