[coreboot] nrv2b cleanup patch (again)

[Stefan Reinauer]

Myles Watson wrote:
> This very short patch fixes nrv2b compression in lar.
>
> It also fixes lzma compression in lar to fix the silent memory
> corruption that was possible when files didn't compress well.
>
> It adds some comments to both files and the file that calls them.
>
> Myles
>
> Signed-off-by: Myles Watson <mylesgw at gmail.com>
>   
Acked-by: Stefan Reinauer <stepan at coresystems.de>

> -	std::memcpy(out, &result[0], *out_len);
> +	if (*out_len < in_len)
> +		std::memcpy(out, &result[0], *out_len);
I think this one should even be memcpy instead of std:memcpy.. I had 
some versions of gcc complain that memcpy is not in the std scope.

Not really part of this patch, but I saw later down you use memcpy 
without std:: anyways.

Stefan



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