We need to check the status field in virtio net config structure
instead of the bits read from ISR register to know whether we need
to do guest announce.
Fixes: 7365504f77 ("net/virtio: support guest announce")
Cc: stable@dpdk.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>