net: ethernet: ti: Use PTR_ERR_OR_ZERO() to simplify code

Fixes coccicheck warning:

drivers/net/ethernet/ti/am65-cpts.c:1017:1-3: WARNING: PTR_ERR_OR_ZERO can be used
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Samuel Zou <zou_wei@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/am65-cpts.c

@@ -1014,10 +1014,7 @@ static int am65_cpts_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	cpts = am65_cpts_create(dev, base, node);
-	if (IS_ERR(cpts))
-		return PTR_ERR(cpts);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(cpts);
 }
 
 static const struct of_device_id am65_cpts_of_match[] = {