D24709: Remove some warnings about unused return values.

[Glen Ditchfield]

gjditchfield created this revision.
Herald added a project: KDE PIM.
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REVISION SUMMARY
  RichTextComposerSignatures::replaceSignature(),
  AttachmentModel::addAttachment(), and Item::appendChildItem() are called
  for their side effects, and their returned values are not error indicators,
  so there's no need to check them.

REPOSITORY
  R94 PIM: Message Library

BRANCH
  retvals (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D24709

AFFECTED FILES
  messagecomposer/src/attachment/attachmentmodel.h
  messagecomposer/src/composer-ng/richtextcomposersignatures.h
  messagelist/src/core/item.h

To: gjditchfield
Cc: kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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