HACK: Disable pen serial enforcement

Perhaps the jumps are being caused by the FIFO queuing up events, leading
to the rest of the driver not seeing them in an unexpectedly-long period
of time? This should only happen if the pen stops reporting a serial
number in the middle of an event stream though, and that does not match
up with what I see in logs...

4.5/wacom_sys.c

@@ -201,8 +201,8 @@ static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
 	if (size > WACOM_PKGLEN_MAX)
 		return 1;
 
-	if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
-		return -1;
+	//if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size))
+	//	return -1;
 
 	memcpy(wacom->wacom_wac.data, raw_data, size);