Don't try to rush waiting sessions of refcount is zero, there cannot be

any (they would hold a reference).

Should be merged to 2.0.3



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3799 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_hash.c

@@ -505,7 +505,8 @@ HSH_Deref(struct worker *w, struct object **oo)
 		r = --o->refcnt;
 		if (!r)
 			VTAILQ_REMOVE(&oh->objcs, oc, list);
-		hsh_rush(oh);
+		else
+			hsh_rush(oh);
 		Lck_Unlock(&oh->mtx);
 	}