decodeoutput: wait for X11 expose event
decodeoutput: wait for X11 expose event

If we allow vaPutSurface to be called before the X window is exposed
then those frames will not get displayed on the X window.  Thus, wait
for the Expose event from X before we return.

Signed-off-by: U. Artie Eoff <32aece0d55055227b44d04b7d0051cf3d04ee871@intel.com>

01org/libyami-utils,01org/libyami-utils,01org/libyami-utils,01org/libyami-utils