D10823: idutils: Fix typo

[Michael Heidelbach]

michaelh added a dependent revision: D10825: Introduce aliases DocId, DeviceId and Inode.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D10823

To: michaelh, adridg, #baloo, #frameworks
Cc: ashaposhnikov, michaelh, kmorwinski, spoorun, nicolasfella, alexeymin
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