Running fuzz_x509v3 fuzz results in failure

[xiaoyuxlu]

Steps:

cd spdmlib
cargo fuzz run fuzz_x509v3

Failing input:

    fuzz/artifacts/fuzz_x509v3/crash-2093d7a2fd00e65e814ac99fdfc72153d0542330                                     

Output of std::fmt::Debug:

    [48, 0, 48, 0, 160, 3, 2, 1, 2, 8, 0, 48, 6, 6, 6, 6, 32, 38, 0, 48, 0, 48, 0, 48, 0, 48, 32, 48, 4, 48, 50, 4

8, 0, 48, 0, 160, 3, 2, 1, 2, 8, 0, 48, 6, 6, 6, 6, 32, 38, 0, 48, 0, 48, 0, 0, 0, 0, 0, 0, 0, 4, 6, 3, 85, 29, 15, 4,
0]

Error:
thread '' panicked at fuzz_targets/../../src/crypto/x509v3.rs:408:24:
index out of bounds: the len is 9 but the index is 9

[xiaoyuxlu]

It looks similar to #71

[xiaoyuxlu]

Fixed by: #72