crypto: engine - Make crypto_engine_exit() return void

All callers ignore the return value, so simplify by not providing one.

Note that crypto_engine_exit() is typically called in a device driver's
remove path (or the error path in probe), where errors cannot be handled
anyhow.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/crypto_engine.c

@@ -552,20 +552,16 @@ EXPORT_SYMBOL_GPL(crypto_engine_alloc_init);
 /**
  * crypto_engine_exit - free the resources of hardware engine when exit
  * @engine: the hardware engine need to be freed
- *
- * Return 0 for success.
  */
-int crypto_engine_exit(struct crypto_engine *engine)
+void crypto_engine_exit(struct crypto_engine *engine)
 {
 	int ret;
 
 	ret = crypto_engine_stop(engine);
 	if (ret)
-		return ret;
+		return;
 
 	kthread_destroy_worker(engine->kworker);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(crypto_engine_exit);
 

include/crypto/engine.h

@@ -78,7 +78,7 @@ struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
 						       bool retry_support,
 						       int (*cbk_do_batch)(struct crypto_engine *engine),
 						       bool rt, int qlen);
-int crypto_engine_exit(struct crypto_engine *engine);
+void crypto_engine_exit(struct crypto_engine *engine);
 
 int crypto_engine_register_aead(struct aead_engine_alg *alg);
 void crypto_engine_unregister_aead(struct aead_engine_alg *alg);