D24584: Add a few const &

[Albert Astals Cid]

aacid closed this revision.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D24584

To: aacid, meven
Cc: meven, kde-frameworks-devel, #baloo, hurikhan77, lots0logs, LeGast00n, fbampaloukas, GB_2, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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