RFR: 8274835: Remove unnecessary castings in java.base

Wed Oct 6 21:08:12 UTC 2021

On Thu, 9 Sep 2021 20:12:47 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> Redundant castings make code harder to read.
> Found them by IntelliJ IDEA.
> I tried to select only casts which are definitely safe to remove. Also didn't touch primitive types casts.

`java.io` change looks all right.

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Marked as reviewed by bpb (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5454