QGstTools: Fix warning about unused m_intervalTimer

Clang does complain about this member not being used.

Change-Id: I02919715be43486f4646ca75deea66fc8a6a2276
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
QGstXvImageBuffer: fix warning about class/struct mismatch

Change-Id: I98df1ce92fab69ad1200066d310aa8bd016b5aca
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
PulseaudioInput: Remove unused members

Clang warns about them.

Change-Id: I8fb2e9bc30f35ec9540b09a34bf23bf9eb671b9c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>