hwrng: optee - Use device-managed registration API

Use devm_hwrng_register to get rid of manual unregistration.

Signed-off-by: Tian Tao <[e-mail]>
Reviewed-by: Sumit Garg <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/char/hw_random/optee-rng.c

···
 	if (err)
 		goto out_sess;
 
-	err = hwrng_register(&pvt_data.optee_rng);
+	err = devm_hwrng_register(dev, &pvt_data.optee_rng);
 	if (err) {
 		dev_err(dev, "hwrng registration failed (%d)\n", err);
 		goto out_sess;
···
 
 static int optee_rng_remove(struct device *dev)
 {
-	hwrng_unregister(&pvt_data.optee_rng);
 	tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
 	tee_client_close_context(pvt_data.ctx);