On restarting worker 0 after shutdown, packets handled by
worker 0 must be incremented only when a packet is received by
it.
Fixes: c3eabff124e6 ("distributor: add unit tests")
Cc: stable@dpdk.org
Signed-off-by: Harman Kalra <hkalra@marvell.com>
Acked-by: David Hunt <david.hunt@intel.com>