[U-Boot] IP_t should be a "packed" struct

[Wolfgang Denk]

Dear Luigi Mantellini,

In message <b73e93990901281258s37f7e4d6hc6c2ff4c5d5fa47b at mail.gmail.com> you wrote:
> 
> > I'd focus on fixing your toolchain.  Your problem will not be confined to
> > protocol headers.
> 
> my toolchain works fine ;)

Except that it adds padding where it doesn't make sense. I think you
want to fix it.

Best regards,

Wolfgang Denk

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