lib/dirio.js
function _fileRead(item, callback, err, data) {
  if (err) return callback(err);
  item.data = data;
  callback(null, item);
}
function _fileRead(item, callback, err, data) {
  if (err) return callback(err);
  item.data = data;
  callback(null, item);
}
function _fileRead ( item , callback , err , data ) { if ( err ) return callback ( err ) ; item . data = data ; callback ( null , item ) ; }
Updates the item with content of the file.
@param {Object} item - Object representing investigated file.
@param {Function} callback - Callback that expects a possible
error and the item.
@param {*} err - Possible error passed by caller.
@param {Buffer} file - Content of the file.
Updates the item with content of the file .