[MAINTAINER UPDATE] security/freebsd-update

If freebsd-update cron fails due to a lack of internet
connection, two emails will be sent -- one with the error
message from fetch(1), and the other from freebsd-update
reporting that patches could not be downloaded.

This patch corrects this mis-behaviour and causes a single
email to be sent in such an event; this will be included
in a future version of the distfile.

PR: ports/72310
Submitted by: Colin Percival <cperciva@daemonology.net>