samples,PushPullSink: Remove compiler warning.
samples,PushPullSink: Remove compiler warning.

qtquickvcp/QtQuickVcp,qtquickvcp/QtQuickVcp,araisrobo/QtQuickVcp,strahlex/QtQuickVcp,araisrobo/QtQuickVcp,JDSquared/QtQuickVcp,strahlex/nzmqt,machinekoder/QtQuickVcp,qtquickvcp/QtQuickVcp,machinekoder/QtQuickVcp,araisrobo/QtQuickVcp,JDSquared/QtQuickVcp,strahlex/QtQuickVcp,machinekoder/QtQuickVcp,bobvanderlinden/QtQuickVcp,strahlex/QtQuickVcp,araisrobo/QtQuickVcp,bobvanderlinden/QtQuickVcp,JDSquared/QtQuickVcp,jonnydee/nzmqt,JDSquared/QtQuickVcp,bobvanderlinden/QtQuickVcp,oskla129/nzmqt,qtquickvcp/QtQuickVcp,machinekoder/QtQuickVcp