benchmark: remove unreachable return

[ZYSzys]

Remove the unreachable return since this.abort has process.exit(1).

node/benchmark/_cli.js

Lines 74 to 84 in 0f8e8f7

	this.abort(usage);
	return;
	}
	}
	}
	module.exports = CLI;
	CLI.prototype.abort = function(msg) {
	console.error(msg);
	process.exit(1);
	};

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

[danbev]

CI: https://ci.nodejs.org/job/node-test-pull-request/20633/

[danbev]

Landed in b4e670d.