virtio-net: fix up HMP NIC info string on reset

When mac is updated on reset, info string has stale data.
Fix it up.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/net/virtio-net.c

@@ -314,6 +314,7 @@ static void virtio_net_reset(VirtIODevice *vdev)
     n->mac_table.uni_overflow = 0;
     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
     memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
+    qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
     memset(n->vlans, 0, MAX_VLAN >> 3);
 }