LSM: Don't ignore initialization failures

LSM initialization failures have traditionally been ignored. We should
at least WARN when something goes wrong.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.morris@microsoft.com>

security/security.c

@@ -55,10 +55,12 @@ static __initdata bool debug;
 static void __init major_lsm_init(void)
 {
 	struct lsm_info *lsm;
+	int ret;
 
 	for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
 		init_debug("initializing %s\n", lsm->name);
-		lsm->init();
+		ret = lsm->init();
+		WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
 	}
 }