actix-service: Fix clippy warning in benches

[popzxc]

PR Type

Refactor

PR Checklist

Check your PR fulfills the following:

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt

Overview

Currently benches code for actix-service emits a clippy::let_and_return warning. This minor PR fixes it.

[codecov]

Codecov Report

Merging #174 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   60.45%   60.41%   -0.05%     
==========================================
  Files          73       73              
  Lines        4785     4785              
==========================================
- Hits         2893     2891       -2     
- Misses       1892     1894       +2     

Impacted Files	Coverage Δ
actix-service/benches/and_then.rs	0.00% <ø> (ø)
actix-service/benches/unsafecell_vs_refcell.rs	0.00% <ø> (ø)
actix-connect/tests/test_connect.rs	87.69% <0.00%> (-3.08%)	⬇️

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[JohnTitor]

Thanks!