kernel/module.c: Free lock-classes if parse_args failed

parse_args call module parameters' .set handlers, which may use locks defined in the module.
So, these classes should be freed in case parse_args returns error(e.g. due to incorrect parameter passed).

Signed-off-by: Andrey Tsyvarev <tsyvarev@ispras.ru>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>