AX88796: Fix locking in ethtool support

Fix a pair of nasty locking problems in the ax88796 driver
spotted by a sparse check:

warning: context imbalance in 'ax_get_settings' - wrong count at exit
warning: context imbalance in 'ax_set_settings' - wrong count at exit
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/net/ax88796.c

@@ -554,7 +554,7 @@ static int ax_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 
 	spin_lock_irqsave(&ax->mii_lock, flags);
 	mii_ethtool_gset(&ax->mii, cmd);
-	spin_lock_irqsave(&ax->mii_lock, flags);
+	spin_unlock_irqrestore(&ax->mii_lock, flags);
 
 	return 0;
 }
@@ -567,7 +567,7 @@ static int ax_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 
 	spin_lock_irqsave(&ax->mii_lock, flags);
 	rc = mii_ethtool_sset(&ax->mii, cmd);
-	spin_lock_irqsave(&ax->mii_lock, flags);
+	spin_unlock_irqrestore(&ax->mii_lock, flags);
 
 	return rc;
 }