Integrated: Fix simple warnings

[Nir Lisker]

On Sun, 7 Apr 2024 16:39:29 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> Fixes for warnings:
> 
> * Missing `@Override` annotations
> * Unnecessary code (casts and semicolons)
> * Unused imports
> 
> There are more complicated warnings that should be looked at separately like resource leaks, potential null access, and unused variables.

This pull request has now been integrated.

Changeset: 1012e57a
Author:    Nir Lisker <nlisker at openjdk.org>
Committer: Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.org/jextract/commit/1012e57acce1aad4c163cd19ffaf7594bdaaef70
Stats:     42 lines in 17 files changed: 8 ins; 13 del; 21 mod

Fix simple warnings

Reviewed-by: jvernee

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PR: https://git.openjdk.org/jextract/pull/229