k0kubun f5fc032eee Remove unused variables
This fixes following warning:

```
test/logger/test_logger.rb:329: warning: assigned but unused variable - read_read
```

[Fix GH-1840]

From: yuuji.yaginuma <yuuji.yaginuma@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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