emaste 2c87363999 cron: use existing maximum username constant MAXLOGNAME
Previously cron had its own maximum username length limit, which was
smaller than the system's MAXLOGNAME. This could lead to crontab -u
updating the wrong user's crontab (if the name was truncated, and
matched another user).

PR:		212305
Reported by:	Andrii Kuzik
Reviewed by:	allanjude, jilles
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D7747
2016-09-02 03:15:54 +00:00
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