refactor: Support standard/no-callback-literal in the lib/compare-solution.js

Author: ledsun

lib/problem.js

@@ -1,5 +1,3 @@
-/* eslint-disable standard/no-callback-literal */
-
 var path = require('path')
 var getFile = require('./get-file')
 var compare = require('./compare-solution')
@@ -25,7 +23,7 @@ module.exports = function createProblem (dirname) {
     var attemptPath = path.resolve(process.cwd(), args[0])
     compare(this.solutionPath, attemptPath, i18n, function (_, match, obj) {
       if (match) {
-        return cb(true)
+        return cb(null, true)
       }
 
       if (!obj) {
@@ -45,7 +43,7 @@ module.exports = function createProblem (dirname) {
         require('./footer.js')
       ]
 
-      cb(false)
+      cb(null, false)
     }.bind(this))
   }