Fix comment that is no more correct as the code evolved.
Fixes: 9470427c88e1 ("net/virtio: do not store PCI device pointer at shared memory")
Cc: stable@dpdk.org
Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>