evmmax: Clean up mul implementation

[chfast]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.17%. Comparing base (ed5562f) to head (beb15c9).

❗ Current head beb15c9 differs from pull request most recent head 8be74aa. Consider uploading reports for the commit 8be74aa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #864      +/-   ##
==========================================
- Coverage   98.27%   98.17%   -0.10%     
==========================================
  Files         129      129              
  Lines       14651    13766     -885     
==========================================
- Hits        14398    13515     -883     
+ Misses        253      251       -2     

Flag	Coverage Δ
statetests	31.04% <100.00%> (+1.65%)	⬆️
statetests-silkpre	21.06% <100.00%> (+1.16%)	⬆️
unittests	93.43% <100.00%> (-0.39%)	⬇️

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Files	Coverage Δ
lib/evmmax/evmmax.cpp	100.00% <100.00%> (ø)

... and 25 files with indirect coverage changes