FreeBSD/src 9dbcff2 (r345320)usr.sbin/freebsd-update freebsd-update.sh

MFC r34505: freebsd-update: restore old exit code when no updates are available
locally

This unbreaks ezjail and iocell, which get into an endless loop trying to
figure out how many times "freebsd-update install" needs to be called.

PR:             229346
Submitted by:   Mike Cole <mcole36 at gmail.com>
Approved by:    bapt
DeltaFile
+1-0usr.sbin/freebsd-update/freebsd-update.sh
+1-01 files

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