Input: elan_i2c - fix regulator enable count imbalance after suspend/resume

Before these changes elan_suspend() would only disable the regulator
when device_may_wakeup() returns false; whereas elan_resume() would
unconditionally enable it, leading to an enable count imbalance when
device_may_wakeup() returns true.

This triggers the "WARN_ON(regulator->enable_count)" in regulator_put()
when the elan_i2c driver gets unbound, this happens e.g. with the
hot-plugable dock with Elan I2C touchpad for the Asus TF103C 2-in-1.

Fix this by making the regulator_enable() call also be conditional
on device_may_wakeup() returning false.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220131135436.29638-2-hdegoede@redhat.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/elan_i2c_core.c

@@ -1388,16 +1388,16 @@ static int __maybe_unused elan_resume(struct device *dev)
 	struct elan_tp_data *data = i2c_get_clientdata(client);
 	int error;
 
-	if (device_may_wakeup(dev) && data->irq_wake) {
-		disable_irq_wake(client->irq);
-		data->irq_wake = false;
-	}
-
+	if (!device_may_wakeup(dev)) {
 		error = regulator_enable(data->vcc);
 		if (error) {
 			dev_err(dev, "error %d enabling regulator\n", error);
 			goto err;
 		}
+	} else if (data->irq_wake) {
+		disable_irq_wake(client->irq);
+		data->irq_wake = false;
+	}
 
 	error = elan_set_power(data, true);
 	if (error) {