The problem was reproducible only with icmp packet type
when det44 in, out interfaces were swapped.
Dst addr was unknown but packet has been forwarded.
Type: fix
Ticket: VPP-1958
Signed-off-by: Daniel Béreš <daniel.beres@pantheon.tech>
Change-Id: Ie446cf2ac866955cc668fe2848f954a2ef92e3fa