Change the assert() that triggers in #167 to spassert().

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2255 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_response.c

@@ -191,7 +191,7 @@ RES_WriteObj(struct sess *sp)
 			VSL_stats->n_objwrite++;
 			WRK_Write(sp->wrk, st->ptr, st->len);
 		}
-		assert(u == sp->obj->len);
+		spassert(u == sp->obj->len);
 		if (sp->esis > 0)
 			WRK_Write(sp->wrk, "\r\n", -1);
 	}