st/va: fix post process dirty area handling

The dirty area in this call isn't related to the screen at all.

v2: set clear dirty area to false as well

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Julien Isorce <j.isorce@samsung.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
1 file changed