Make EXP_Ttl() take a pointer to struct exp rather than struct object

bin/varnishd/cache/cache.h

@@ -928,7 +928,7 @@ extern pthread_t cli_thread;
 /* cache_expiry.c */
 void EXP_Clr(struct exp *e);
 
-double EXP_Ttl(const struct req *, const struct object*);
+double EXP_Ttl(const struct req *, const struct exp*);
 double EXP_When(const struct exp *exp);
 void EXP_Insert(struct objcore *oc);
 void EXP_Inject(struct objcore *oc, struct lru *lru, double when);

bin/varnishd/cache/cache_expire.c

@@ -76,14 +76,14 @@ EXP_Clr(struct exp *e)
  */
 
 double
-EXP_Ttl(const struct req *req, const struct object *o)
+EXP_Ttl(const struct req *req, const struct exp *e)
 {
 	double r;
 
-	r = o->exp.ttl;
+	r = e->ttl;
 	if (req != NULL && req->d_ttl > 0. && req->d_ttl < r)
 		r = req->d_ttl;
-	return (o->exp.t_origin + r);
+	return (e->t_origin + r);
 }
 
 /*--------------------------------------------------------------------
@@ -468,7 +468,7 @@ exp_expire(struct exp_priv *ep, double now)
 	CHECK_OBJ_NOTNULL(o, OBJECT_MAGIC);
 	VSLb(&ep->vsl, SLT_ExpKill, "EXP_Expired x=%u t=%.0f",
 	    oc_getxid(&ep->wrk->stats, oc) & VSL_IDENTMASK,
-	    EXP_Ttl(NULL, o) - now);
+	    EXP_Ttl(NULL, &o->exp) - now);
 	(void)HSH_DerefObjCore(&ep->wrk->stats, &oc);
 	return (0);
 }

bin/varnishd/cache/cache_hash.c

@@ -430,7 +430,7 @@ HSH_Lookup(struct req *req, struct objcore **ocp, struct objcore **bocp,
 		if (o->vary != NULL && !VRY_Match(req, o->vary))
 			continue;
 
-		if (EXP_Ttl(req, o) >= req->t_req) {
+		if (EXP_Ttl(req, &o->exp) >= req->t_req) {
 			/* If still valid, use it */
 			assert(oh->refcnt > 1);
 			assert(oc->objhead == oh);