HID: magicmouse: Fix an error handling path in magicmouse_probe()

commit 33812fc7c8 upstream.

If the timer introduced by the commit below is started, then it must be
deleted in the error handling of the probe. Otherwise it would trigger
once the driver is no more.

Fixes: 0b91b4e4da ("HID: magicmouse: Report battery level over USB")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Tested-by: José Expósito <jose.exposito89@gmail.com>
Reported-by: <syzbot+a437546ec71b04dfb5ac@syzkaller.appspotmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hid/hid-magicmouse.c

@@ -873,6 +873,7 @@ static int magicmouse_probe(struct hid_device *hdev,
 
 	return 0;
 err_stop_hw:
+	del_timer_sync(&msc->battery_timer);
 	hid_hw_stop(hdev);
 	return ret;
 }