Fix memory leak on smack_cipso
Fix memory leak on smack_cipso

smack_cipso_free() didn't release main pointer, which was
inconsistent with header description and further usage in
apply_cipso_file().
(cherry picked from commit 6304f9a3f73312a7feb3b25fa593919744acb947)

smack-team/smack,jobol/smack,jobol/smack,smack-team/smack