[Merge] lp:~boiko/dialer-app/fix_call_end_warnings into lp:dialer-app

[Gustavo Pichorim Boiko]

Gustavo Pichorim Boiko has proposed merging lp:~boiko/dialer-app/fix_call_end_warnings into lp:dialer-app.

Commit message:
Fix a lot of warnings.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1368438 in dialer-app: "Call ends with several warnings"
  https://bugs.launchpad.net/dialer-app/+bug/1368438

For more details, see:
https://code.launchpad.net/~boiko/dialer-app/fix_call_end_warnings/+merge/239127

Fix a lot of warnings.
-- 
https://code.launchpad.net/~boiko/dialer-app/fix_call_end_warnings/+merge/239127
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~boiko/dialer-app/fix_call_end_warnings into lp:dialer-app.
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