stmmac: drop unnecessary dt checks in stmmac_probe_config_dt

Since the caller already check the presence of a of_node there
is no need to repeat the check in stmmac_probe_config_dt.

There is also no point in checking the return value of the
of_match_device function since if there wasn't match in the
first place we would never be in this function.
Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

@@ -112,13 +112,7 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
 	const struct of_device_id *device;
 	struct device *dev = &pdev->dev;
 
-	if (!np)
-		return -ENODEV;
-
 	device = of_match_device(dev->driver->of_match_table, dev);
-	if (!device)
-		return -ENODEV;
-
 	if (device->data) {
 		const struct stmmac_of_data *data = device->data;
 		plat->has_gmac = data->has_gmac;