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strerror() is commonly used. For example in kselftest which currently needs to do an #ifdef NOLIBC to handle the lack of strerror(). Keep it simple and reuse the output format of perror() for strerror(). Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>