InlineX509DataProvider skips credential extraction if only X509SKI is present

[Cantor, Scott]

>I know the OP made reference to the HOK spec, but I didn't think the HOK
>aspect was what he was asking about, since his question was about the
>response signature.

I didn't see anything that explicitly clarified which KeyInfo was involved
or that it was a response signature. I probably missed something.

-- Scott