failedHandler in downloadTask is called twice

[xnz23]

if downloadTask runs in an error it calls its failedHandler twice.

here is why:
TOSMBSessionDownloadTask

• (void)didFailWithError:(NSError *)error
  calls failHandler.error in super didFailWithError
  and (some lines later) it calls failHandler.error

in my opinion it should call failHandler.error only once.

Hardware / Software

Which version of the library were you using?
version 2.1
Which version of iOS are you running?
version 9.3.5 (13G36)
What model of iOS device were you testing on?
MD531E/A
If using CocoaPods, which version of CocoaPods are you on?
no cocoaPods

good luck
jens