[PWGLF] Fix code-checker problems in flattenictyPikp.cxx

[gbencedi]

No description provided.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 64d59c8 at 2026-07-02 23:09:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 7 errors and 0 warnings.'
Found 7 errors and 0 warnings.
++ [[ 7 -gt 0 ]]
++ cat /sw/BUILD/9ea0bca7ddb70ec463b613d148d0c24078343b50/O2Physics-code-check/errors.txt
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:72:1: error: included header cstdint is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:1865:45: error: repeated branch body in conditional chain [bugprone-branch-clone,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:1871:45: error: repeated branch body in conditional chain [bugprone-branch-clone,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:1877:46: error: repeated branch body in conditional chain [bugprone-branch-clone,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:2187:51: error: the parameter 'h' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:2211:51: error: the parameter 'num' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:2211:61: error: the parameter 'den' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 7 -gt 0 ]]
++ exit 1
--

Full log here.

[vkucera]

@gbencedi Thanks for the fixes. Please add the where in the PR title.

[alibuild]

Error while checking build/O2Physics/code-check for de21e32 at 2026-07-03 21:29:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 3 errors and 0 warnings.'
Found 3 errors and 0 warnings.
++ [[ 3 -gt 0 ]]
++ cat /sw/BUILD/f2d0d0f0aeb006c9e46ff1ea67d1faaeeed39fa4/O2Physics-code-check/errors.txt
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:1864:45: error: repeated branch body in conditional chain [bugprone-branch-clone,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:1870:45: error: repeated branch body in conditional chain [bugprone-branch-clone,-warnings-as-errors]
PWGLF/Tasks/GlobalEventProperties/flattenictyPikp.cxx:1876:46: error: repeated branch body in conditional chain [bugprone-branch-clone,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 3 -gt 0 ]]
++ exit 1
--

Full log here.

[alibuild]

Auto-approving on behalf of @gbencedi.