[PATCH v1.1] realpath: Bring back GNU extension on ENOENT and EACCES [BZ #28996]

[Andreas Schwab]

On Mär 30 2022, Siddhesh Poyarekar via Libc-alpha wrote:

> The GNU extension for realpath states that if the path resolution fails
> with ENOENT or EACCES and the resolved buffer is non-NULL, it will
> contain part of the path that failed resolution.
>
> commit 949ad78a189194048df8a253bb31d1d11d919044 broke this when it
> omitted the copy on failure.  Bring it back partially to continue
> supporting this GNU extension.

Ok.

-- 
Andreas Schwab, schwab@linux-m68k.org
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