apparmor: move task from common_audit_data to apparmor_audit_data

apparmor is the only LSM that uses the common_audit_data tsk field.
Instead of making all LSMs pay for the stack space move the aa usage into
the apparmor_audit_data.

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c
index 3ecb8b7..b66a0e4 100644
--- a/security/apparmor/capability.c
+++ b/security/apparmor/capability.c
@@ -67,8 +67,8 @@
 	struct apparmor_audit_data aad = {0,};
 	COMMON_AUDIT_DATA_INIT(&sa, LSM_AUDIT_DATA_CAP);
 	sa.aad = &aad;
-	sa.tsk = task;
 	sa.u.cap = cap;
+	sa.aad->tsk = task;
 	sa.aad->op = OP_CAPABLE;
 	sa.aad->error = error;