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[ Upstream commite9a40e1585] Do not cast to "unsigned char", as this needlessly creates type problems when attempting builds without -Wno-pointer-sign[1]. The intent of the cast is to drop possible "const" types. [1] https://lore.kernel.org/lkml/CAHk-=wgz3Uba8w7kdXhsqR1qvfemYL+OFQdefJnkeqXG8qZ_pA@mail.gmail.com/ Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Fixes:3009f891bb("fortify: Allow strlen() and strnlen() to pass compile-time known lengths") Cc: linux-hardening@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Sasha Levin <sashal@kernel.org>