net/iavf: fix VLAN insertion
net/iavf: fix VLAN insertion

Fix wrong VLAN insertion position as inner.

Fixes: 1e728b01120c ("net/iavf: rework Tx path")

Signed-off-by: Radu Nicolau <fa459cf59d47c122ba776e9a6f631c862bf44680@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk