kbuild: Enable -Wuninitialized
This helps fine very dodgy behavior through both -Wuninitialized (warning that a variable is always uninitialized) and -Wsometimes-uninitialized (warning that a variable is sometimes uninitialized, like GCC's -Wmaybe-uninitialized). These warnings catch things that GCC doesn't such as: https://lore.kernel.org/lkml/86649ee4-9794-77a3-502c-f4cd10019c36@lca.pw/ We very much want to catch these so turn this warning on so that CI is aware of it. Link: https://github.com/ClangBuiltLinux/linux/issues/381Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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