ossl_quic_err_to_string
const char *ossl_quic_err_to_string(uint64_t error_code);
const char *err_str = ossl_quic_err_to_string(error_code);
e_str = ossl_quic_err_to_string(cc_info.error_code);
e_str = ossl_quic_err_to_string(tcause->error_code);
e_str = ossl_quic_err_to_string(cc_info.error_code);