Zmodn_mat: deduplicate, reduce ccalls

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.94%. Comparing base (784c28a) to head (d9dbb61).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1803 +/- ## ========================================== - Coverage 85.95% 85.94% -0.01% ========================================== Files 95 95 Lines 36417 36405 -12 ========================================== - Hits 31303 31290 -13 - Misses 5114 5115 +1 ```

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