crypto_provider: fix clippy::question_mark finding

[cpu]

error: this `match` expression can be replaced with `?`
   --> src/crypto_provider.rs:466:20
    |
466 |       let provider = match provider_from_crate_features() {
    |  ____________________^
467 | |         Some(provider) => provider,
468 | |         None => return None,
469 | |     };
    | |_____^ help: try instead: `provider_from_crate_features()?`