The function _ssl__SSLContext_load_verify_locations_impl currently contains the following code:

        if (r != 1) {
            ok = 0;
            if (errno != 0) {
                ERR_clear_error();
                PyErr_SetFromErrno(PyExc_OSError);
            }
            else {
                _setSSLError(NULL, 0, __FILE__, __LINE__);
            }
            goto error;
        }
    }
    goto end;

  error:
    ok = 0;

It is unnecessary to set ok to 0 before jumping to error because the first instruction after the error label does the same thing.