moxa: fix the error handling in moxart_mac_probe()

This patch fix the error handling in moxart_mac_probe():
 - return -ENOMEM in some memory alloc fail cases
 - add missing free_netdev() in the error handling case

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/moxa/moxart_ether.c

@@ -448,7 +448,8 @@ static int moxart_mac_probe(struct platform_device *pdev)
 	irq = irq_of_parse_and_map(node, 0);
 	if (irq <= 0) {
 		netdev_err(ndev, "irq_of_parse_and_map failed\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto irq_map_fail;
 	}
 
 	priv = netdev_priv(ndev);
@@ -472,24 +473,32 @@ static int moxart_mac_probe(struct platform_device *pdev)
 	priv->tx_desc_base = dma_alloc_coherent(NULL, TX_REG_DESC_SIZE *
 						TX_DESC_NUM, &priv->tx_base,
 						GFP_DMA | GFP_KERNEL);
-	if (priv->tx_desc_base == NULL)
+	if (priv->tx_desc_base == NULL) {
+		ret = -ENOMEM;
 		goto init_fail;
+	}
 
 	priv->rx_desc_base = dma_alloc_coherent(NULL, RX_REG_DESC_SIZE *
 						RX_DESC_NUM, &priv->rx_base,
 						GFP_DMA | GFP_KERNEL);
-	if (priv->rx_desc_base == NULL)
+	if (priv->rx_desc_base == NULL) {
+		ret = -ENOMEM;
 		goto init_fail;
+	}
 
 	priv->tx_buf_base = kmalloc(priv->tx_buf_size * TX_DESC_NUM,
 				    GFP_ATOMIC);
-	if (!priv->tx_buf_base)
+	if (!priv->tx_buf_base) {
+		ret = -ENOMEM;
 		goto init_fail;
+	}
 
 	priv->rx_buf_base = kmalloc(priv->rx_buf_size * RX_DESC_NUM,
 				    GFP_ATOMIC);
-	if (!priv->rx_buf_base)
+	if (!priv->rx_buf_base) {
+		ret = -ENOMEM;
 		goto init_fail;
+	}
 
 	platform_set_drvdata(pdev, ndev);
 
@@ -522,7 +531,8 @@ static int moxart_mac_probe(struct platform_device *pdev)
 init_fail:
 	netdev_err(ndev, "init failed\n");
 	moxart_mac_free_memory(ndev);
-
+irq_map_fail:
+	free_netdev(ndev);
 	return ret;
 }