net: ethernet: ti: cpsw: fix error return code in cpsw_probe()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 83a8471ba2 ("net: ethernet: ti: cpsw: refactor probe to group common hw initialization")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Link: https://lore.kernel.org/r/1605250173-18438-1-git-send-email-zhangchangzhong@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/ti/cpsw.c

@@ -1634,6 +1634,7 @@ static int cpsw_probe(struct platform_device *pdev)
 				       CPSW_MAX_QUEUES, CPSW_MAX_QUEUES);
 	if (!ndev) {
 		dev_err(dev, "error allocating net_device\n");
+		ret = -ENOMEM;
 		goto clean_cpts;
 	}