D25039: Fix Clazy performance issues, const &

[Méven Car]

meven added a comment.


  In D25039#557579 <https://phabricator.kde.org/D25039#557579>, @kossebau wrote:
  
  > Not tested, only read code. Looks good to me.
  >  Please remove the newInstance method in a direct commit before, and drop change from this patch. (If you prefer, can do the remove commit as well myself)
  
  
  I did test it. Maybe not with the exact last changeset. I will run the tests again before pushing juste to make sure.
  Feel free to do the code removal, if I don't do it first, I will be afk for a few days, I will rebase on master the branch.
  Btw I have already commited the changes to SlaveBase::configValue si it makes it to KF5.64 regardless of when this vers merged.

REPOSITORY
  R241 KIO

BRANCH
  arcpatch-D25039

REVISION DETAIL
  https://phabricator.kde.org/D25039

To: meven, #frameworks, dfaure, kossebau
Cc: ahmadsamir, anthonyfieroni, kossebau, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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