Fix potential uninitialized in Symmetric building of NormalChol cache

[codecov[bot]]

Codecov Report

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

Comparison is base (26ac213) 65.39% compared to head (f10bc70) 65.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #453 +/- ## ========================================== + Coverage 65.39% 65.44% +0.04% ========================================== Files 27 27 Lines 2104 2101 -3 ========================================== - Hits 1376 1375 -1 + Misses 728 726 -2 ```

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