CODETOOLS-7902911: jcstress: Fix new Sonar warnings

[shipilev]

Recent work introduced a few new complaints from Sonar. Let us fix them.

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed

Issue

• CODETOOLS-7902911: jcstress: Fix new Sonar warnings

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jcstress pull/42/head:pull/42
$ git checkout pull/42

Update a local copy of the PR:
$ git checkout pull/42
$ git pull https://git.openjdk.java.net/jcstress pull/42/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 42

View PR using the GUI difftool:
$ git pr show -t 42

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jcstress/pull/42.diff

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[mlbridge]

Webrevs

• 00: Full (52425a12)