Small clean up to test-timers.js

test/mjsunit/test-timers.js

@@ -7,12 +7,11 @@ var setTimeout_called = false;
 
 assert.equal(true, setTimeout instanceof Function);
 var starttime = new Date;
-
 setTimeout(function () {
   var endtime = new Date;
 
   var diff = endtime - starttime;
-  if (diff < 0) diff = -diff;
+  assert.ok(diff > 0);
   puts("diff: " + diff);
 
   assert.equal(true, 1000 - WINDOW < diff && diff < 1000 + WINDOW);
@@ -28,7 +27,7 @@ setInterval(function () {
   var endtime = new Date;
 
   var diff = endtime - starttime;
-  if (diff < 0) diff = -diff;
+  assert.ok(diff > 0);
   puts("diff: " + diff);
 
   var t = interval_count * 1000;