scripts/Makefile.extrawarn: Do not disable clang's -Wformat-zero-length
There are no instances of this warning in the tree across several difference architectures and configurations. This was added by commit 26ea6bb1 ("kbuild, LLVMLinux: Supress warnings unless W=1-3") back in 2014, where it might have been necessary, but there are no instances of it now so stop disabling it to increase warning coverage for clang. Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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