Fix a regression introduced on revision r271909, when using argument -g
or several hops we have segmentation fault because we overwrite the same
structure to store information for host and gateway.

Submitted by: Maryse Levavasseur <maryse.levavasseur@stormshield.eu>
Reworked by: hrs
Approved by: re (hrs)
Differential Revision: https://reviews.freebsd.org/D6980