Pcapng option bounds check

[tf2spi]

This PR fixes an off-by-one bounds check for PCAPNG options parsing. It uses < when <= is also acceptable, meaning the last option of valid PCAPNG files could be missed. For most files, it's end-of-option anyways, but this option need not be present.

This PR also adds a regression test which fails the assertion without the change and succeeds with the change.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.59%. Comparing base (7106b01) to head (aaabdf0).
Report is 35 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4699      +/-   ##
==========================================
- Coverage   81.64%   78.59%   -3.06%     
==========================================
  Files         359      336      -23     
  Lines       86235    81627    -4608     
==========================================
- Hits        70409    64157    -6252     
- Misses      15826    17470    +1644     

see 291 files with indirect coverage changes

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[guedou]

Thanks for this PR!