whitespace fixes

remove trailing spaces & expand tabs.

Change-Id: I05ef110abed90f13b47752760ffb4567a11a6a5e
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>

src/multimediawidgets/qpaintervideosurface.cpp

@@ -841,7 +841,7 @@ QAbstractVideoSurface::Error QVideoSurfaceArbFpPainter::paint(
         painter->fillRect(target, Qt::black);
         return QAbstractVideoSurface::NoError;
     }
- 
+
     const QAbstractVideoBuffer::HandleType h = m_frame.handleType();
     if (h == QAbstractVideoBuffer::NoHandle || h == QAbstractVideoBuffer::GLTextureHandle) {
         bool stencilTestEnabled = glIsEnabled(GL_STENCIL_TEST);