Fix first-run page in Opera

lib/localstorage/io.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 35 matching lines @@
 
   readFromFile: function(file, decode, listener, callback, timeLineID)
   {
     var Utils = require("utils").Utils;
     Utils.runAsync(function()
     {
       if ("spec" in file && /^defaults\b/.test(file.spec))
       {
         // Code attempts to read the default patterns.ini, we don't have that.
         // Make sure to execute first-run actions instead.
-        callback(null);
         if (localStorage.currentVersion)
           seenDataCorruption = true;
         delete localStorage.currentVersion;
+        callback(null);
         return;
       }
 
       var path = this._getFilePath(file);
       if (!(path in window.localStorage))
       {
         callback(new Error("File doesn't exist"))
         return;
       }
 
@@ skipping 58 matching lines @@
   {
     var path = this._getFilePath(file);
     callback(null, {
       exists: path in window.localStorage,
       isDirectory: false,
       isFile: true,
       lastModified: parseInt(window.localStorage[path + "/lastModified"], 10) || 0
     });
   }
 };