Fixes compilation with -save-temps flag (IDFGH-12615)

[denizzzka]

Project's root CMakeLists.txt:

cmake_minimum_required(VERSION 3.16)

# Preserve *.i files
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -save-temps")

include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(mcu_software)

If try to compile with -save-temps and with:

CONFIG_COMPILER_DISABLE_GCC12_WARNINGS=y
CONFIG_COMPILER_DISABLE_GCC13_WARNINGS=y

it causes error:
$ idf.py build lib
[...]
components/spiffs/spiffs/src/spiffs_nucleus.c: In function 'spiffs_populate_ix_map_v':
components/spiffs/spiffs/src/spiffs_nucleus.c:682:348: error: self-comparison always evaluates to false [-Werror=tautological-compare]

This PR fixes compilation for such case

Depends from #13612

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[igrr]

@denizzzka Thanks for the PR, I think we can accept both changes in one branch (i.e. this PR). Could you please update the commit messages as suggested above by the checker, and click through the CLA?

[denizzzka]

Please pay attention to this PR

[denizzzka]

(still relevant)