HID: wacom: generic: Clear ABS_MISC when tool leaves proximity

The tool ID information sent in ABS_MISC is expected to be reset to 0
when a tool leaves proximity. Not doing this can cause problems if a
tool is removed and then re-introduced. Kernel event filtering will
prevent the (identical) ABS_MISC event from being sent when the tool
re-enters proxmity. This can cause userspace to not properly set the
tool ID.

Fixes: f85c9dc678 ("HID: wacom: generic: Support tool ID and additional tool types")
Cc: stable # v4.10 <[e-mail]>
Signed-off-by: Ping Cheng <[e-mail]>
Signed-off-by: Jason Gerecke <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/wacom_wac.c

···
 		input_report_key(input, wacom_wac->tool[0], prox);
 		if (wacom_wac->serial[0]) {
 			input_event(input, EV_MSC, MSC_SERIAL, wacom_wac->serial[0]);
-			input_report_abs(input, ABS_MISC, id);
+			input_report_abs(input, ABS_MISC, prox ? id : 0);
 		}
 
 		wacom_wac->hid_data.tipswitch = false;