Back to my style in flush

lib/storage.js

@@ -59,13 +59,14 @@ storage.flushToStorage = function (options, callback) {
     if (err) { return callback(err); }
     fs.fsync(fd, function (errFS) {
       fs.close(fd, function (errC) {
-        var e = null;
         if (errFS || errC) {
-          e = new Error('Failed to flush to storage');
+          var e = new Error('Failed to flush to storage');
           e.errorOnFsync = errFS;
           e.errorOnClose = errC;
-        }
           return callback(e);
+        } else {
+          return callback(null);
+        }
       });
     });
   });