HID: lenovo: Remove sysfs group on failure path

There is no sysfs_group_remove() on failure path in lenovo_probe_tpkbd().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>