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       ERR_clear_error - clear the error queue
        #include <openssl/err.h>
        void ERR_clear_error(void);
       ERR_clear_error() empties the current thread's error queue.
       ERR_clear_error() has no return value.
       err(3), ERR_get_error(3)
       ERR_clear_error() is available in all versions of SSLeay and OpenSSL.
1.0.2t                            2019-09-10                ERR_clear_error(3)