Avoid integer divide by zero (backport #1750)

[mergify]

This is an automatic backport of pull request #1750 done by Mergify.
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	both modified:   src/minoltamn_int.cpp

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[codecov]

Codecov Report

Merging #1753 (66fc7c7) into main (8c4d67c) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1753      +/-   ##
==========================================
+ Coverage   66.94%   67.08%   +0.14%     
==========================================
  Files         151      151              
  Lines       20794    20789       -5     
==========================================
+ Hits        13920    13946      +26     
+ Misses       6874     6843      -31     

Impacted Files	Coverage Δ
include/exiv2/value.hpp	92.50% <100.00%> (+1.87%)	⬆️
src/minoltamn_int.cpp	59.13% <100.00%> (+5.62%)	⬆️
src/tags_int.cpp	87.20% <100.00%> (ø)
src/sonymn_int.cpp	89.47% <0.00%> (+33.91%)	⬆️

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[hassec]

Thanks @kevinbackhouse 👍