JSHint bug with multiple input files and the Checkstyle reporter.

example.js

function example(unused) {}

grunt output

Running "jshint:console_works" (jshint) task
>> 1 file lint free.

Running "jshint:checkstyle_works" (jshint) task
<?xml version="1.0" encoding="utf-8"?>
<checkstyle version="4.3">
        <file name="Gruntfile.js">
        </file>
</checkstyle>

Running "jshint:console_works2" (jshint) task
>> 2 files lint free.

Running "jshint:checkstyle_broken" (jshint) task
<?xml version="1.0" encoding="utf-8"?>
<checkstyle version="4.3">
        <file name="Gruntfile.js">
        </file>
        <file name="example.js">
                <error line="1" column="0" severity="warning" message="Unused variable: &apos;example&apos;" source="jshint.implied-unuseds" />
        </file>
</checkstyle>

Gruntfile.js

/*global module*/
module.exports = function (grunt) {
    "use strict";

    var singleInput = ["Gruntfile.js"],
        multiInput = ["Gruntfile.js", "example.js"],
        unused;

    grunt.initConfig({
        jshint: {
            options: {
                unused: false
            },
    		console_works: {
                src: singleInput
            },
            checkstyle_works: {
                src: singleInput,
                options: {
                    reporter: "checkstyle"
                }
            },
            console_works2: {
                src: multiInput
            },
            checkstyle_broken: {
                src: multiInput,
                options: {
                    reporter: "checkstyle"
                }
            }
        }
    });

    grunt.loadNpmTasks("grunt-contrib-jshint");

    grunt.registerTask("default", ["jshint"]);
};