Fix issue in URLSession:task:didCompleteWithError:

Author: pandamicro

cocos/network/CCDownloader-apple.mm

@@ -418,26 +418,20 @@ - (void)URLSession:(NSURLSession *)session task :(NSURLSessionTask *)task
         else
         {
             NSInteger statusCode = ((NSHTTPURLResponse*)task.response).statusCode;
-            std::vector<unsigned char> buf; // just a placeholder
-            const char *orignalURL = [task.originalRequest.URL.absoluteString cStringUsingEncoding:NSUTF8StringEncoding];
-            std::string errorMessage = "";
 
             // Check for error status code
             if (statusCode >= 400)
             {
-                errorMessage = cocos2d::StringUtils::format("Downloader: Failed to download %s with status code (%d)", orignalURL, (int)statusCode);
-            }
-            // Unknown issue
-            else
-            {
-                errorMessage = cocos2d::StringUtils::format("Downloader: Failed to download %s with unknown error", orignalURL);
+                std::vector<unsigned char> buf; // just a placeholder
+                const char *orignalURL = [task.originalRequest.URL.absoluteString cStringUsingEncoding:NSUTF8StringEncoding];
+                std::string errorMessage = cocos2d::StringUtils::format("Downloader: Failed to download %s with status code (%d)", orignalURL, (int)statusCode);
+                
+                _outer->onTaskFinish(*[wrapper get],
+                                     cocos2d::network::DownloadTask::ERROR_IMPL_INTERNAL,
+                                     0,
+                                     errorMessage,
+                                     buf);
             }
-            
-            _outer->onTaskFinish(*[wrapper get],
-                                 cocos2d::network::DownloadTask::ERROR_IMPL_INTERNAL,
-                                 0,
-                                 errorMessage,
-                                 buf);
         }
     }
     [self.taskDict removeObjectForKey:task];