i2c: Drop unneeded check for of_node

of_find_property() will return NULL if of_node is NULL,
thus of_irq_get_by_name() returns -EINVAL which we ignore,
so no need to double check.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/i2c-core-base.c

@@ -350,13 +350,11 @@ static int i2c_device_probe(struct device *dev)
 		return -ENODEV;
 
 	if (client->flags & I2C_CLIENT_WAKE) {
-		int wakeirq = -ENOENT;
+		int wakeirq;
 
-		if (dev->of_node) {
-			wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
-			if (wakeirq == -EPROBE_DEFER)
-				return wakeirq;
-		}
+		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
+		if (wakeirq == -EPROBE_DEFER)
+			return wakeirq;
 
 		device_init_wakeup(&client->dev, true);