Smack: Fix setting label on successful file open

Smack: Fix setting label on successful file open

While opening with CAP_MAC_OVERRIDE file label is not set.
Other calls may access it after CAP_MAC_OVERRIDE is dropped from process.

Change-Id: I937d070e1c0cb251f4a0dd3291efbc94be3ca548
Signed-off-by: Marcin Niesluchowski <m.niesluchow@samsung.com>
Signed-off-by: Rafal Krypa <r.krypa@samsung.com>
Origin: git://git.gitorious.org/smack-next/kernel.git# smack-for-3.18
(cherry picked from commit 6047a807302a008d48bd2a4822025b725580c361)

Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>