crl: fix clippy::question_mark finding

[cpu]

Fixes a failing ci task w/ Rust 1.97 of the form:

error: this `match` expression can be replaced with `?`
   --> src/crl/types.rs:357:13
    |
357 | /             match revoked_cert_result {
358 | |                 Err(e) => return Err(e),
359 | |                 Ok(revoked_cert) => {
360 | |                     if revoked_cert.serial_number.eq(serial) {
...   |
364 | |             }
    | |_____________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.97.0/index.html#question_mark
    = note: `-D clippy::question-mark` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::question_mark)]`

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.64%. Comparing base (3d9f011) to head (d30313a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
- Coverage   97.64%   97.64%   -0.01%     
==========================================
  Files          20       20              
  Lines        4072     4070       -2     
==========================================
- Hits         3976     3974       -2     
  Misses         96       96              

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