ripd & ripngd: avoid the zero interface metric

The interface metric is initialized to 0 in the commit db19c85:
zebra: set metric for directly connected routes via netlink to 0

Ripd and ripngd must be aware of it and avoid increase the
route metric by 0.

Signed-off-by: Feng Lu <lu.feng@6wind.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
2 files changed