Improvement: clang-tidy fixes #3382

Job	Run time
fine_grained_trigger	8s
t8code_w_shipped_submodules_tests / t8code_cmake_tests	6m 34s
preparation (OFF) / cmake_preparation	1m 43s
preparation (ON) / cmake_preparation	1m 52s
t8code_code_coverage / generate-codecov	4m 39s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	4m 39s
t8code_api_tests (ON, Debug) / t8code_cmake_tests	4m 40s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	1m 27s
t8code_api_tests (ON, Release) / t8code_cmake_tests	4m 39s
t8code_tests (ON, Release) / t8code_cmake_tests	4m 40s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	4m 24s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	4m 40s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	4m 39s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	4m 39s
t8code_tests (OFF, Debug) / t8code_cmake_tests	1m 35s
t8code_tests (OFF, Release) / t8code_cmake_tests	4m 38s
t8code_tests (ON, Debug) / t8code_cmake_tests	4m 39s
t8code_valgrind_tests	0s
t8code_doxygen_check	0s
t8code_tarball	0s
	1h 4m 15s

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