net/mlx5: fix build with MinGW 13

After an upgrade to MinGW version 13, compilation breaks:

drivers/net/mlx5/windows/mlx5_ethdev_os.c:285:69: error:
	'dev_link.<U1000>.<Uaf00>.link_autoneg' may be used uninitialized

This is because link_autoneg is never set in mlx5_link_update().
It can be set to the previous value (no change).
Also it does not make sense to check this value to return the update status
as it does not change.

Fixes: 6fbd737 ("net/mlx5: support link update on Windows")
Cc: [email protected]

Signed-off-by: Thomas Monjalon <[email protected]>
Acked-by: Dariusz Sosnowski <[email protected]>
Acked-by: Bruce Richardson <[email protected]>

Author: tmonjalo

drivers/net/mlx5/windows/mlx5_ethdev_os.c

@@ -283,11 +283,11 @@ mlx5_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 	dev_link.link_duplex = 1;
 	if (dev->data->dev_link.link_speed != dev_link.link_speed ||
 	    dev->data->dev_link.link_duplex != dev_link.link_duplex ||
-	    dev->data->dev_link.link_autoneg != dev_link.link_autoneg ||
 	    dev->data->dev_link.link_status != dev_link.link_status)
 		ret = 1;
 	else
 		ret = 0;
+	dev_link.link_autoneg = dev->data->dev_link.link_autoneg;
 	dev->data->dev_link = dev_link;
 	return ret;
 }