vdpau branch: Added assert if all surfaces are in use.
vdpau branch: Added assert if all surfaces are in use.

svn path=/branches/libavg_vdpau/; revision=5851

hoodie/libavg,yyd01245/libavg,scotty007/libavg,th3infinity/libavg,libavg/libavg,scotty007/libavg,scotty007/libavg,th3infinity/libavg,hoodie/libavg,yyd01245/libavg,libavg/libavg,th3infinity/libavg,yyd01245/libavg,th3infinity/libavg,hoodie/libavg,scotty007/libavg,libavg/libavg,libavg/libavg,yyd01245/libavg,hoodie/libavg