crypto: rk3288 - Fix use after free in unprepare

The unprepare call must be carried out before the finalize call
as the latter can free the request.

Fixes: c66c17a0f69b ("crypto: rk3288 - Remove prepare/unprepare request")
Reported-by: Andrey Skvortsov <[e-mail]>
Cc: <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>
Reviewed-by: Andrey Skvortsov <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/rockchip/rk3288_crypto_ahash.c

···
 theend:
 	pm_runtime_put_autosuspend(rkc->dev);
 
+	rk_hash_unprepare(engine, breq);
+
 	local_bh_disable();
 	crypto_finalize_hash_request(engine, breq, err);
 	local_bh_enable();
-
-	rk_hash_unprepare(engine, breq);
 
 	return 0;
 }