Review Request: some warnings from clang++

[Jaime Torres Amate]

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http://git.reviewboard.kde.org/r/103171/
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Review request for Calligra.


Description
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I'm still not able to compile calligra with clang 2.99.9999, but some meaningful warnings are produced.
Instead of doing a comparation and loose the result, set the value.
Return 0 (as nullptr) instead of false.


Diffs
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  filters/words/rtf/import/rtf-qt/src/UserPropsDestination.cpp 4e6d185 
  plan/libs/models/kptnodeitemmodel.cpp 1ecb9f4 

Diff: http://git.reviewboard.kde.org/r/103171/diff/diff


Testing
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still compiles with g++


Thanks,

Jaime Torres Amate

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