Input: elan_i2c - do not leave interrupt disabled on suspend failure

Make sure interrupts are not left disabled when we fail to suspend the
touch controller.

Fixes: 6696777c65 ("Input: add driver for Elan I2C/SMbus touchpad")
Link: https://lore.kernel.org/r/ZmKiiL-1wzKrhqBj@google.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/elan_i2c_core.c

@@ -1356,6 +1356,8 @@ static int elan_suspend(struct device *dev)
 	}
 
 err:
+	if (ret)
+		enable_irq(client->irq);
 	mutex_unlock(&data->sysfs_mutex);
 	return ret;
 }