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.

Suggested that so@ publish an errata and merge this to releng/14.2.

PR: 283116
MFH: 3 days