Impact: fix sparse warnings
Fix the following sparse warnings:
security/security.c:228:2: warning: returning void-valued expression
security/security.c:233:2: warning: returning void-valued expression
security/security.c:616:2: warning: returning void-valued expression
Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: James Morris <jmorris@namei.org>