DEBUG: log SyncSurface RETURN to confirm clean exit before crash

src/surface.c

@@ -368,6 +368,8 @@ VAStatus RequestSyncSurface(VADriverContextP context, VASurfaceID surface_id)
 
 	if (surface_object->status != VASurfaceRendering) {
 		status = VA_STATUS_SUCCESS;
+		request_log("  RequestSyncSurface(surf=%u) early-exit, status=%d\n",
+			    surface_id, surface_object->status);
 		goto complete;
 	}
 
@@ -474,6 +476,8 @@ error:
 	}
 
 complete:
+	request_log("  RequestSyncSurface(surf=%u) RETURN status=%d\n",
+		    surface_id, status);
 	return status;
 }