st/va: retrieve size from the temporary img variable

"image" is not ready yet since it will be set at
the end of the function by: *image = *img;

Signed-off-by: Julien Isorce <j.isorce@samsung.com>
Reviewed-by: Christian K<C3><B6>nig <christian.koenig@amd.com>
1 file changed