D16674: MTP: fix runtime warning when showing a warning to the user.

[Aleix Pol Gonzalez]

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

REPOSITORY
  R320 KIO Extras

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16674

To: dfaure, akrutzler, elvisangelaccio, apol
Cc: kde-frameworks-devel, kfm-devel, alexde, sourabhboss, feverfew, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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