bug in truncate(1) - all FreeBSD versions

[Ighighi Ighighi]

The file in question is: /usr/src/usr.bin/truncate/truncate.c

I'm working on a portable version of truncate(1) and I noticed a lot of
"continue" statements in the main while() loop that skip the call to
close(fd) at the end.  The obvious consequence is a file descriptor leak...

There's still another bug: parselength() does not need to return off_t
because its return value is checked in the usual binary (0 vs -1) way.

Salutes,
Igh