D9399: Fix crash, presumably since Qt 5.10?

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: Frameworks, dfaure.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  We are opening the stream as read only and skipRawData would complain that
  it's a write-only device, and skipping needs reading:
  QIODevice::skip (QBuffer): WriteOnly device
  It was a weird optimization anyway, so just pass the information like the
  rest of the data and it works just fine.
  
  BUG: 386364

TEST PLAN
  The check on the bug report passes now, and akregator fetches
  all feeds again.

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9399

AFFECTED FILES
  src/ioslaves/http/http.cpp

To: apol, #frameworks, dfaure
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