image-host: small improvements and fixes.

[Paul Barker]

On 27/09/2023 12:59, Hugo Cornelis wrote:
> Yocto build can involve very long filenames.  These two patches protect
> the Yocto build from failing without a sensible error message and
> increase the path length for the cipher key for the kernel from 128 to
> 256 characters.
> 
> 

For both patches: see the documentation on sending patches [1],
particularly the section on commit message conventions. Your patches are
missing 'Signed-off-by' lines at least.

[1]: https://u-boot.readthedocs.io/en/latest/develop/sending_patches.html

Thanks,
Paul
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