Dropped in the following commit:

commit a3e6f654 ("Input: wacom - keep wacom_ids ordered")
Reported-by: Hans Spath <inbox-546@hans-spath.de>
CC: stable@vger.kernel.org    # v3.17+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>