D29105: Network Filesharing: Fix compile warnings and trivial improvements

[Alexander Lohnau]

alex created this revision.
alex added reviewers: Dolphin, ngraham, mlaurent.
alex requested review of this revision.

REVISION SUMMARY
  Fix compile warnings:
  warning: zero as null pointer constant 
  warning: variable ‘result’ set but not used
  
  Additionally some improved overloads and formatting which does not 
  deserve a sepearte patch ;-).

TEST PLAN
  Compiles

REPOSITORY
  R432 File Sharing (Samba) integration

BRANCH
  fix_warnings (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29105

AFFECTED FILES
  samba/filepropertiesplugin/delegate.cpp
  samba/filepropertiesplugin/model.cpp
  samba/filepropertiesplugin/sambausershareplugin.cpp

To: alex, #dolphin, ngraham, mlaurent
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