airo: use netstats in net_device structure

Use net_device_stats from net_device structure instead of local.
Changed airo_read_stats function parameter to net_device.

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed