net: gemini: Fix missing free_netdev() in error path of gemini_ethernet_port_probe()

Replace alloc_etherdev_mq with devm_alloc_etherdev_mqs. In this way,
when probe fails, netdev can be freed automatically.

Fixes: 4d5ae32f ("net: ethernet: Add a driver for Gemini gigabit ethernet")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cortina/gemini.c

@@ -2389,7 +2389,7 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
 
 	dev_info(dev, "probe %s ID %d\n", dev_name(dev), id);
 
-	netdev = alloc_etherdev_mq(sizeof(*port), TX_QUEUE_NUM);
+	netdev = devm_alloc_etherdev_mqs(dev, sizeof(*port), TX_QUEUE_NUM, TX_QUEUE_NUM);
 	if (!netdev) {
 		dev_err(dev, "Can't allocate ethernet device #%d\n", id);
 		return -ENOMEM;
@@ -2521,7 +2521,6 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
 	}
 
 	port->netdev = NULL;
-	free_netdev(netdev);
 	return ret;
 }
 
@@ -2530,7 +2529,6 @@ static int gemini_ethernet_port_remove(struct platform_device *pdev)
 	struct gemini_ethernet_port *port = platform_get_drvdata(pdev);
 
 	gemini_port_remove(port);
-	free_netdev(port->netdev);
 	return 0;
 }