D17051: Use correct variable type for returned value from read/sendfile

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17051

To: davidedmundson, apol
Cc: kde-frameworks-devel, michaelh, ngraham, bruns