Make bans depend on OC_F_PRIVATE

bin/varnishd/cache/cache_hash.c

@@ -655,7 +655,10 @@ HSH_Unbusy(struct dstat *ds, struct objcore *oc)
 	CHECK_OBJ(oh, OBJHEAD_MAGIC);
 
 	AN(oc->flags & OC_F_BUSY);
-	AN(oc->ban);
+	if (oc->flags & OC_F_PRIVATE)
+		AZ(oc->ban);
+	else
+		AN(oc->ban);
 	assert(oh->refcnt > 0);
 
 	/* XXX: pretouch neighbors on oh->objcs to prevent page-on under mtx */

bin/varnishd/storage/stevedore.c

@@ -289,7 +289,7 @@ STV_MkObject(struct stevedore *stv, struct busyobj *bo,
 
 	o->objcore = bo->fetch_objcore;
 	bo->fetch_objcore = NULL;     /* refcnt follows pointer. */
-	if (o->objcore->objhead != NULL)
+	if (!(o->objcore->flags & OC_F_PRIVATE))
 		BAN_NewObjCore(o->objcore);
 
 	o->objcore->methods = &default_oc_methods;