amd-xgbe: Fix error return code in xgbe_probe()

Fix to return error code -ENODEV from the DMA is not supported error
handling case instead of 0, as done elsewhere in this function.
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/xgbe/xgbe-main.c

@@ -613,6 +613,7 @@ static int xgbe_probe(struct platform_device *pdev)
 	attr = device_get_dma_attr(dev);
 	if (attr == DEV_DMA_NOT_SUPPORTED) {
 		dev_err(dev, "DMA is not supported");
+		ret = -ENODEV;
 		goto err_io;
 	}
 	pdata->coherent = (attr == DEV_DMA_COHERENT);