[PATCH] libcsupport: Fix TOCTOU in getchark()

[Sebastian Huber]

On 28/07/2021 18:27, Joel Sherrill wrote:
> The commit message should explain that.

I will try to improve the commit message.

> 
> I don't see a CID for this one in the reports but someone should check
> that. I don't like their web interface and might have missed something.

I noticed this while reviewing the code. The rtems_putc() has a similar 
issue.

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