D7123: Several cleanups

[Fabian Vogt]

fvogt created this revision.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  - No cppcheck warnings anymore
  - Use snprintf everywhere
  - Avoid pointless multiplication with sizeof(char)
  - Avoid memory leaks

TEST PLAN
  Still builds, works the same as before.

REPOSITORY
  R107 KWallet PAM Integration

BRANCH
  patch1

REVISION DETAIL
  https://phabricator.kde.org/D7123

AFFECTED FILES
  pam_kwallet.c

To: fvogt, #plasma
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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