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Replace open-coded mutex handling with cleanup.h guard(mutex) and scoped_guard(mutex, ...). Cc: Guilherme G. Piccoli <gpiccoli@igalia.com> Cc: Tony Luck <tony.luck@intel.com> Cc: <linux-hardening@vger.kernel.org> Link: https://lore.kernel.org/r/20231205182622.1329923-2-keescook@chromium.org Signed-off-by: Kees Cook <keescook@chromium.org>