net: cpsw: Add missing return value

ret is set 0 at this point, so jumping to that error label would result
in a return value of 0. Set ret to -ENOMEM to return a proper error
value.

Signed-off-by: Markus Pargmann <[e-mail]>
Reviewed-by: Wolfram Sang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/ti/cpsw.c

···
 	priv->irq_enabled = true;
 	if (!priv->cpts) {
 		dev_err(&pdev->dev, "error allocating cpts\n");
+		ret = -ENOMEM;
 		goto clean_ndev_ret;
 	}