radeon/vce: fix memory leak

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/drivers/radeon/radeon_vce.c

@@ -98,6 +98,7 @@ static void rvce_destroy(struct pipe_video_codec *encoder)
 		rvid_destroy_buffer(&fb);
 	}
 	rvid_destroy_buffer(&enc->cpb);
+	enc->ws->cs_destroy(enc->cs);
 	FREE(enc);
 }