Make sure to handle duplicated stopRecording calls safely

Change-Id: Id2054daca9b0607b5739466d1e7a54583dd87d40
Call recording: catch exception on stop; fix member var naming

- when recording is stopped immediately after start, runtime exception
  is thrown to notify the app that the recording file should be deleted
  as it does not contain any useful data
- follow naming convention of member variables: use 'mRecorder' instead of
  'recorder'

Change-Id: I1c9d1752700b1d570a69774b54acd8ece03503da
ringtone: increase max wait time for CallerInfo query to 1500ms

Change-Id: Ib1f871d1116423e2195a524a485d1d928b0f0755