net/ntp: Undo upstream (ntp.org) fix for upstream Bug 3851

The patch for upstream (ntp.org) fix for upstream Bug 3851 may have
fixed a Linux bug but it caused a regression when ntpd is run on
FreeBSD.

PR: 283116
(cherry picked from commit 43537eb9c3e5d588ec4add6973ae03c6053a863a)