Review Request 126400: [GCI] Fix some Clazy warnings

[Imran Tatriev]

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https://git.reviewboard.kde.org/r/126400/
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Review request for KDE Frameworks.


Repository: kconfig


Description
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I've fixed some warnings, here they are:

- Unneeded heap allocation with QString
- Detaching temporary
- Multi-arg non-usage
- isEmpty() non-usage
- midRef() non-usage
- "QVariant::toFoo() instead of QVariant::value<Foo>()" non-usage


Diffs
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  autotests/kconfig_compiler/kconfigcompiler_test.cpp 231e3c4 
  autotests/kconfig_compiler/kconfigcompiler_test_signals.cpp 9a26ca1 
  src/core/kconfiggroup.cpp e09d602 
  src/core/kemailsettings.cpp 59d5f6e 
  src/gui/kconfiggroupgui.cpp b8d3089 
  src/kconf_update/kconf_update.cpp 9567c2d 
  src/kconf_update/kconfigutils.cpp 12b0749 
  src/kconfig_compiler/kconfig_compiler.cpp 91f6005 
  src/kreadconfig/kwriteconfig.cpp a852c28 

Diff: https://git.reviewboard.kde.org/r/126400/diff/


Testing
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Thanks,

Imran Tatriev

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