clippy: manual_ok_err

[yihau]

Problem

part of nightly rust bumping #5952

https://rust-lang.github.io/rust-clippy/master/index.html#manual_ok_err

Summary of Changes

fix it

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.8%. Comparing base (8d5c4ba) to head (ad08d58).

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #5957     +/-   ##
=========================================
- Coverage    82.8%    82.8%   -0.1%     
=========================================
  Files         830      830             
  Lines      377289   377287      -2     
=========================================
- Hits       312526   312507     -19     
- Misses      64763    64780     +17     

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