[Rust] Fix clippy error

[asfimport]

Reporter: Jorge Leitão / @jorgecarleitao
Assignee: Andrew Lamb / @alamb

Related issues:

• [Rust] Clippy CI is failing (duplicates)

PRs and other links:

• GitHub Pull Request #9476

_{Note: This issue was originally created as ARROW-11603. Please see the migration documentation for further details.}

[asfimport]

Jorge Leitão / @jorgecarleitao:
Issue resolved by pull request 9476
#9476