sbin/tpm2-evt-log-parser.awk: Fix reference to uninitialized element

[miczyg1]

Fixes the issue with reference to uninitialized element :

Entry 2:
    PCR:        255
    Event Type: 0x401
    Digests:
      SHA256: 0000000000000000000000000000000000000000000000000000000000000000
gawk: /usr/sbin/tpm2-evt-log-parser.awk:67: (FILENAME=/tmp/log.bin FNR=1) fatal: reference to uninitialized element `SYMTAB["SHA256_255"] is not allowed'

The PCR mapping event uses the PCR 0xff according to Intel TXT MLE Software Development Guide.

[krystian-hebel]

LGTM, but please add the same also to txt-tpm1-evt-log-parser.awk so it won't surprise us later.

[miczyg1]

LGTM, but please add the same also to txt-tpm1-evt-log-parser.awk so it won't surprise us later.

Done

[miczyg1]

@krystian-hebel ping