selinux: fix bad cleanup on error in hashtab_duplicate()

selinux: fix bad cleanup on error in hashtab_duplicate()

The code attempts to free the 'new' pointer using kmem_cache_free(),
which is wrong because this function isn't responsible of freeing it.
Instead, the function should free new->htable and clear the contents of
*new (to prevent double-free).

Cc: [email protected]
Fixes: c7c556f1e81b ("selinux: refactor changing booleans")
Reported-by: Wander Lairson Costa <[email protected]>
Signed-off-by: Ondrej Mosnacek <[email protected]>
Signed-off-by: Paul Moore <[email protected]>