apparmor: Adjust offset when accessing task blob.

AppArmor will no longer be the only user of task blob
after TOMOYO started using task blob.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: f4ad8f2c ("LSM: Infrastructure management of the task security")
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>

security/apparmor/include/task.h

@@ -16,7 +16,7 @@
 
 static inline struct aa_task_ctx *task_ctx(struct task_struct *task)
 {
-	return task->security;
+	return task->security + apparmor_blob_sizes.lbs_task;
 }
 
 /*