The previous fix was adding the sentinel before refilling rx,
which gave the NIC time to overwrite it with a new descriptor.
Ticket: VPP-2087
Type: fix
Fixes: 8b4d474abd
Change-Id: I32bde4a763a62fb66c5c3871d9f10af6066e2d47
Signed-off-by: Vratko Polak <vrpolak@cisco.com>