Fixed clang warning unsequenced modifcation

[codecov[bot]]

Codecov Report

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

Comparison is base (29a9720) 92.52% compared to head (2e14563) 92.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ======================================= Coverage 92.52% 92.52% ======================================= Files 31 31 Lines 3852 3852 Branches 61 62 +1 ======================================= Hits 3564 3564 Misses 243 243 Partials 45 45 ``` | [Flag](https://app.codecov.io/gh/rath3t/dune-iga/pull/30/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex_Mueller) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/rath3t/dune-iga/pull/30/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex_Mueller) | `92.52% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex_Mueller#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/rath3t/dune-iga/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex_Mueller) | Coverage Δ | | |---|---|---| | [dune/iga/trim/subgrid.hh](https://app.codecov.io/gh/rath3t/dune-iga/pull/30?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alex_Mueller#diff-ZHVuZS9pZ2EvdHJpbS9zdWJncmlkLmho) | `94.73% <ø> (ø)` | |

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