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Restyle Make platform PlatformManager::PostEvent() return status #9578

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@restyled-io restyled-io bot commented Sep 9, 2021

A duplicate of #9573 with additional commits that automatically address
incorrect style, created by Restyled.

⚠️ Even though this PR is not a Fork, it contains outside contributions.
Please review accordingly.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.

The following Restylers made fixes:

To incorporate these changes, you can either:

  1. Merge this Pull Request instead of the original, or

  2. Ask your contributor to locally incorporate these commits and push them to
    the original Pull Request

    Expand for example instructions
    ```console
    git remote add upstream https://github.com/project-chip/connectedhomeip.git
    git fetch upstream pull/<this PR number>/head
    git merge --ff-only FETCH_HEAD
    git push
    ```
    

NOTE: As work continues on the original Pull Request, this process will
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kpschoedel and others added 3 commits September 9, 2021 15:32
#### Problem

`void PlatformManager::PostEvent()` can fail on some platforms, but does
not report this to callers.

In the #9543 case, an intermediate layer unconditionally returned
`CHIP_NO_ERROR`, and `Inet` code assumed it could actually test whether
`PostEvent()` succeeded.

Fixes #9543 _PacketBuffer leak_

#### Change overview

Made `PlatformManager::PostEvent()` return `CHIP_ERROR`.
Marked it `[[nodiscard]]` to catch all uses, and made callers
propagate or at least log any error.

#### Testing

CI.
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