Resolve "[ci] incorrect comparison in clang-format-check job"

• Related issues: #824 (closed)
• Requested reviewers: @kiene, @pihlajakuja, @kinuthia

Reason why this change is needed

• The clang-format-check job bash script part has an error checking the return value of the check-format.sh script

Description of the change

• The comparison has been updated

Affected operating points

• BE, CI only change

Related to #824 (closed)