[ruby/yarp] Fix unused variable in YARPRubyAPITest
https://github.com/ruby/yarp/commit/0556f971ce
[ruby/yarp] Fix unused variable in YARPRubyAPITest
https://github.com/ruby/yarp/commit/0556f971ce