D20939: Aztec: Fix padding if the last partial codeword is all one bits

[Volker Krause]

vkrause added reviewers: svuorela, nicolasfella.

REPOSITORY
  R280 Prison

REVISION DETAIL
  https://phabricator.kde.org/D20939

To: vkrause, svuorela, nicolasfella
Cc: kde-frameworks-devel, michaelh, ngraham, bruns