D5402: always close the downloaded file after downloading

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  sometimes the downloaded file isn't correctly flushed to
  disk, causing corrupted zip files, especially if they come
  from github that does a redirect. Unconditionally closing it
  fixes the problem

TEST PLAN
  downloaded the unity8 gtk3 theme that comes from github and is fine,
  other files coming directly from store.kde.org are fine as well

REPOSITORY
  R304 KNewStuff

BRANCH
  phab/closeFile

REVISION DETAIL
  https://phabricator.kde.org/D5402

AFFECTED FILES
  src/core/jobs/httpworker.cpp

To: mart, #plasma, leinir, bshah
Cc: plasma-devel, #frameworks, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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