HID: uclogic: Disable pen usage for Huion keyboard interfaces

Disable pen usage inputs for Huion interfaces reporting on-the-frame
buttons. We don't want to change those, as they mostly work, but we want
to avoid creation of a mute pen interface, confusing to users.
Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-uclogic-params.c

@@ -713,7 +713,8 @@ static int uclogic_params_huion_init(struct uclogic_params *params,
 
 	/* If it's a custom keyboard interface */
 	if (bInterfaceNumber == 1) {
-		/* Keep everything intact */
+		/* Keep everything intact, but mark pen usage invalid */
+		p.pen.usage_invalid = true;
 		goto output;
 	/* Else, if it's not a pen interface */
 	} else if (bInterfaceNumber != 0) {