HID: uclogic: apply quirk NO_EMPTY_INPUT

NO_EMPTY_INPUT is useful when MULTI_INPUT is set. It prevents to create
empty input nodes that user space does not know what to do with.

It does not seem to be required at the moment, this is just a preventive
patch. This check is only made during the plug of the device, so it does
not hurt to have it.
Reviewed-by: NNikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-uclogic.c

@@ -868,6 +868,7 @@ static int uclogic_probe(struct hid_device *hdev,
 	 * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
 	 */
 	hdev->quirks |= HID_QUIRK_MULTI_INPUT;
+	hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
 
 	/* Allocate and assign driver data */
 	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);