ospfd: fixup log message in ospf_zebra_delete

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
zebra: match gateway when deleting NEXTHOP_IPV4_IFINDEX routes

Signed-off-by: Christian Franke <chris@opensourcerouting.org>
zebra: log routes w/o gateway in rib_delete_ipv4

Signed-off-by: Christian Franke <chris@opensourcerouting.org>