Fix integer overflow in channel_converter_unsigned_integral_nondivisible

[sdebionne]

Description

Fix a potential integer overflow in channel conversion.

References

Closes#730

Tasklist

• Add test case(s)
• Ensure all CI builds pass
• Review and approve

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.05%. Comparing base (d8e50eb) to head (4664a7e).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@ Coverage Diff @@## develop #801 +/- ##
========================================
Coverage 82.05% 82.05% ========================================
Files 117 117 Lines 5383 5384 +1 ========================================
+ Hits 4417 4418 +1 
Misses 966 966 

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