D26103: Put Q_REQUIRED_RESULT in front of the functions to fix builds with [[nodiscard]]

[Hannah von Reth]

vonreth created this revision.
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REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D26103

AFFECTED FILES
  src/ioslaves/ftp/ftp.h

To: vonreth
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns