tpm2_load_pcr_signature() propagates the JSON parser's errno, and the parser reports a string that is not valid UTF-8 as -EUCLEAN. With EUCLEAN now mapping to io.systemd.Credentials.PCRsKeptChanging, such a file would be reported as if a PCR were being extended continuously. Translate it where it originates, so that the errno stays single valued for every caller of tpm2_load_pcr_signature() and not only for the creds one: a signature file that cannot be parsed is -EBADMSG, whichever way it is malformed. A syntax error used to come out as -EINVAL, which matched nothing on the way out either. Signed-off-by: Alberto Planas <aplanas@suse.com>
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