fix buffer size calculation in fields_base::prefix_op_t

[ashtum]

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[cppalliance-bot]

An automated preview of the documentation is available at https://156.http-proto.prtest.cppalliance.org/index.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.91%. Comparing base (1e7def4) to head (c30c019).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #156      +/-   ##
===========================================
+ Coverage    92.89%   92.91%   +0.02%     
===========================================
  Files           80       80              
  Lines         4956     4956              
===========================================
+ Hits          4604     4605       +1     
+ Misses         352      351       -1     

Files with missing lines	Coverage Δ
src/fields_base.cpp	95.56% <100.00%> (+0.18%)	⬆️

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[cppalliance-bot]

An automated preview of the documentation is available at https://156.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://156.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://156.http-proto.prtest.cppalliance.org/index.html