kni: fix packet loss in loopback mode
kni: fix packet loss in loopback mode

kni_net fixed to prevent losing packet bytes when doing loopback.

Signed-off-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>
Reported-by: Daniel Kaminsky <923d562f7a568d0de9c294e70212a4bb35a979a1@infinitelocality.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk