net: mdio-gpio: Use device_is_compatible()

Replace open coded variant of device_is_compatible().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mdio/mdio-gpio.c

@@ -132,8 +132,7 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
 		new_bus->phy_ignore_ta_mask = pdata->phy_ignore_ta_mask;
 	}
 
-	if (dev->of_node &&
-	    of_device_is_compatible(dev->of_node, "microchip,mdio-smi0")) {
+	if (device_is_compatible(dev, "microchip,mdio-smi0")) {
 		bitbang->ctrl.op_c22_read = 0;
 		bitbang->ctrl.op_c22_write = 0;
 		bitbang->ctrl.override_op_c22 = 1;