Fixed warnings in qwidget-compositor.
Fixed warnings in qwidget-compositor.

Change-Id: I22f12e2d78f2951e1c1c5a3b2c05794f0c26abb6
Reviewed-by: Jørgen Lind <6105bb7d7ebdd613cef5835c4a38d29949bd95ac@nokia.com>

Tofee/qtwayland,ntanibata/qtwayland,ntanibata/qtwayland,locusf/qtwayland-1,Tofee/qtwayland,locusf/qtwayland-1,locusf/qtwayland-1,Tofee/qtwayland,ntanibata/qtwayland,locusf/qtwayland-1