Fix minor bug in csa algorithm

[mpadge]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.61%. Comparing base (0c04b5c) to head (70513af).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/csa.cpp	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
- Coverage   82.00%   81.61%   -0.39%     
==========================================
  Files          20       20              
  Lines        1989     1953      -36     
==========================================
- Hits         1631     1594      -37     
- Misses        358      359       +1     

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