D15145: Fixes minor memory leak in the KNSBackend

[David Hallas]

hallas created this revision.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
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REVISION SUMMARY
  Fixes minor memory leak in the KNSBackend, the destructor of KNSBackend
  failed to delete the contents of the m_rootCategories vector.

TEST PLAN
  Build with -fsanitize=address
  Open and close Discover

REPOSITORY
  R134 Discover Software Store

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D15145

AFFECTED FILES
  libdiscover/backends/KNSBackend/KNSBackend.cpp

To: hallas
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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