Fix for issue 111

Fix for issue 111

Code was reading data outside the output tensor. However, to the best of my knowledge, the code was never writing outside the resulting block so the output should be equivalent to before this fix. Decoding of AI classD sequences that were encoded without this fix can be correctly decoded after the fix. Decoding of entire test set is ongoing.

This simple oneliner fix is likely equivalent with merge request 279. However, I had problems checking out that code (permission denied) so I could not yet test if 279 is also giving equivalent results.