longparas: none of the callers check for the error case

so we can safely change the return of 0xFFFF to 0 without
changing any callers. Which makes this safe seeing as before
now every caller would have done something stupid with the
results

Change-Id: I10d9f12525de10661ed82f3405e6c728d38be106
longparas: don't truncate lone glossary entries

Change-Id: Ib74830671694f2c78adc7a11296971a7edd2f781