net: mvpp2: Fix error return code in mvpp2_probe()

Fix to return -ENODEV from the no ports enabled error handling
case instead of 0.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -6307,6 +6307,7 @@ static int mvpp2_probe(struct platform_device *pdev)
 	port_count = of_get_available_child_count(dn);
 	if (port_count == 0) {
 		dev_err(&pdev->dev, "no ports enabled\n");
+		err = -ENODEV;
 		goto err_gop_clk;
 	}