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Fix failure to add an interface prefix route

Description

Fix failure to add an interface prefix route
when route with the same prefix is already presented
in the routing table.

PR: 277125
Reported by: Oleksandr Ignatyev <alex@i.org.ua>
Reviewed by: ae, jlduran
Tested by: jlduran
Differential Revision: https://reviews.freebsd.org/D47534

(cherry picked from commit 1da4954c92ea7585b352ba830d3ee64ca69ada52)

Details