media: ti-vpe: cal: Unregister video device before cleanup

In cal_remove(), unregister the video devices as the first operation,
before cleaning up the V4L2 objects, to avoid use-after-free. This isn't
a complete solution yet, as video nodes can be kept open across
unregistration.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/ti-vpe/cal.c

@@ -2320,11 +2320,11 @@ static int cal_remove(struct platform_device *pdev)
 		if (ctx) {
 			ctx_dbg(1, ctx, "unregistering %s\n",
 				video_device_node_name(&ctx->vdev));
+			cal_ctx_v4l2_unregister(ctx);
 			cal_camerarx_disable(ctx->phy);
 			v4l2_async_notifier_unregister(&ctx->notifier);
 			v4l2_async_notifier_cleanup(&ctx->notifier);
 			cal_ctx_v4l2_cleanup(ctx);
-			cal_ctx_v4l2_unregister(ctx);
 		}
 	}