Fix parsing errors in `ctap_parse_hmac_secret`#582

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stevenwdv wants to merge 2 commits intosolokeys:masterfrom stevenwdv:fixes

Commits on Oct 14, 2021

Fix parsing errors in ctap_parse_hmac_secret: saltEnc type was not checked causing assertion to fail; parameters could be omitted by duplicating known keys, causing parsed_count to increase anyway.
stevenwdv
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Commits on Oct 19, 2021

Fixed other type checking bug in ctap_parse_hmac_secret
stevenwdv
committed