Fix compiler warnings with GCC 16, glibc 2.43#21950

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arnaud-lb:compiler-warnings

Commits on May 5, 2026

Fix compiler warning with GCC 16: variable 'offset' set but not used [-Werror=unused-but-set-variable=]
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Fix compiler warning with glibc 2.43 support of C23 const-preserving standard library macros: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
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