tv_get_string_buf(typval_T *varp, char_u *buf)
{
    char_u	*res = tv_get_string_buf_chk(varp, buf);

    return res != NULL ? res : (char_u *)"";
}
tv_get_string_buf(typval_T *varp, char_u *buf)
{
    char_u	*res = tv_get_string_buf_chk(varp, buf);

    return res != NULL ? res : (char_u *)"";
}