Fixed: patterns.ini contents are being processed multiple times

lib/io.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 144 matching lines @@
 
         if (timeLineID)
         {
           TimeLine.asyncEnd(timeLineID);
           TimeLine.asyncDone(timeLineID);
         }
 
         callback(null);
       };
 
-      let onError = function(result)
+      let onError = function(status)
       {
         if (processing)
         {
           // Still processing data, delay processing this event.
-          error = result;
+          error = status;
           return;
         }
 
         let e = Cc["@mozilla.org/js/xpc/Exception;1"].createInstance(Ci.nsIXPCException);
-        e.initialize("File read operation failed", result, null, Components.stack, file, null);
+        e.initialize("File read operation failed", status, null, Components.stack, file, null);
         callback(e);
 
         if (timeLineID)
         {
           TimeLine.asyncDone(timeLineID);
         }
       };
 
       request.addEventListener("progress", function(event)
       {
         Utils.runAsync(onProgress.bind(this, event.target.response));
       }, false);
       request.addEventListener("load", function(event)
       {
         Utils.runAsync(onLoad.bind(this));
       }, false);
       request.addEventListener("error", function(event)
       {
-        Utils.runAsync(onError.bind(this, event.result));
+        Utils.runAsync(onError.bind(this, event.target.channel.status));
       }, false);
 
       request.send(null);
     }
     catch (e)
     {
       callback(e);
     }
   },
   /**
@@ skipping 180 matching lines @@
         isFile: exists && file.isFile(),
         lastModified: exists ? file.lastModifiedTime : 0
       });
     }
     catch(e)
     {
       callback(e);
     }
   }
 }