k5_utf8_to_utf16le
int k5_utf8_to_utf16le(const char *utf8, uint8_t **utf16_out,
ret = k5_utf8_to_utf16le(utf8, &utf16, &utf16len);
err = k5_utf8_to_utf16le(utf8, ©str, ©strlen);
ret = k5_utf8_to_utf16le(princ_name_utf8, &princ_name_utf16,
ret = k5_utf8_to_utf16le(t->utf8, &utf16, &utf16len);