[027] Fix integer overflow #2179

[piponazo]

Fix #2179 on 0.27-maintenance

I dit not add the unit tests here as I did in #2181 because the lack of modern C++ support makes the work more cumbersome.

[codecov]

Codecov Report

Merging #2194 (e54f5c9) into 0.27-maintenance (3409ddd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           0.27-maintenance    #2194   +/-   ##
=================================================
  Coverage             58.87%   58.88%           
=================================================
  Files                   149      149           
  Lines                 23205    23209    +4     
  Branches              12713    12717    +4     
=================================================
+ Hits                  13662    13666    +4     
  Misses                 6702     6702           
  Partials               2841     2841           

Impacted Files	Coverage Δ
src/jpgimage.cpp	69.93% <100.00%> (+0.16%)	⬆️

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[kmilos]

LGTM