linux-phytec-ti

security: Fix comment of security_key_permission

Comment for return value of security_key_permission() has been wrong
since it was added in 2.6.15.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>