cleanup: Replace pointer arithmetic with explicit `&arr[i]`.

[iphydf]

It's equivalent, but MISRA requires the latter form. It helps readability in some cases where the type of the overloaded operator+ is unclear.

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This change is 

[codecov[bot]]

Codecov Report

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

Comparison is base (ca4606d) 73.70% compared to head (5dd9ee3) 73.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2675 +/- ## ========================================== + Coverage 73.70% 73.75% +0.05% ========================================== Files 148 148 Lines 30482 30482 ========================================== + Hits 22466 22482 +16 + Misses 8016 8000 -16 ```

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