diff --git a/lib/report.js b/lib/report.js
index <HASH>..<HASH> 100644
--- a/lib/report.js
+++ b/lib/report.js
@@ -37,7 +37,7 @@ module.exports = function simpleReport(options) {
             failed = true;
         }
 
-        return cb(undefined, file);
+        return cb(null, file);
     });
 
     if (options.emitErrorAtEnd) {
Use more recognizable callback pattern in "report.js"

- Before: "cb(undefined, value)"
- Now, more typical: "cb(null, value)"