refactor codelist view, put conditional if to return early

src/app/debugger/debuggerUI/vmDebugger/CodeListView.js

@@ -46,7 +46,7 @@ CodeListView.prototype.init = function () {
 }
 
 CodeListView.prototype.indexChanged = function (index) {
-  if (index >= 0) {
+  if (index < 0) return
   if (this.itemSelected) {
     this.itemSelected.removeAttribute('selected')
     this.itemSelected.removeAttribute('style')
@@ -61,16 +61,16 @@ CodeListView.prototype.indexChanged = function (index) {
     this.itemSelected.firstChild.setAttribute('style', 'margin-left: 2px')
   }
   this.codeView.scrollTop = this.itemSelected.offsetTop - parseInt(this.codeView.offsetTop)
-  }
 }
 
 CodeListView.prototype.changed = function (code, address, index) {
-  if (this.address !== address) {
+  if (this.address === address) {
+    return this.indexChanged(index)
+  }
   this.code = code
   this.address = address
   this.codeView = this.renderAssemblyItems()
   this.basicPanel.setContent(this.codeView)
-  }
   this.indexChanged(index)
 }