fix syntax

core.cm

@@ -84,11 +84,12 @@ var _fps_sample_pos = 0
 
 function fps_add_sample(sample) {
   var n = length(_fps_samples)
+  var old = null
   if (n < _fps_sample_count) {
     push(_fps_samples, sample)
     _fps_sample_sum += sample
   } else {
-    var old = _fps_samples[_fps_sample_pos]
+    old = _fps_samples[_fps_sample_pos]
     _fps_samples[_fps_sample_pos] = sample
     _fps_sample_sum += sample - old
     _fps_sample_pos++
@@ -165,22 +166,25 @@ function _main_loop() {
   }
 
   // Render
+  var render_result = null
+  var dbg = false
+  var stats = null
   if (_config.render) {
-    var render_result = _config.render()
+    render_result = _config.render()
     if (render_result) {
       if (_config.debug == 'graph') {
         log.console(render_result)
         $stop()
         return
       }
-      var dbg = _config.debug == 'cmd'
-      
+      dbg = _config.debug == 'cmd'
+
       // Build stats for debug_imgui
-      var stats = {
+      stats = {
         fps: _current_fps,
         frame_time_ms: _frame_time_ms
       }
-      
+
       // Handle both compositor result ({commands: [...]}) and fx_graph (graph object)
       if (render_result.commands) {
         if (_config.imgui || _config.editor) {