Fix false positive in conversion overflow check from uint8/int8 type

[ccojocar]

fixes #1185

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.30%. Comparing base (a39ec5a) to head (7eea6b7).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1188   +/-   ##
=======================================
  Coverage   67.30%   67.30%           
=======================================
  Files          74       74           
  Lines        3992     3992           
=======================================
  Hits         2687     2687           
  Misses       1186     1186           
  Partials      119      119           

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[ccoVeille]

Thanks