add missed FS sync callback

Edward Rudd

2014-10-17 b417381b0aef6d37ad93f9c6440c71755d02f0b5

 client/library/library_cloudfs.js

@@ -37,6 +37,8 @@
              if (err) return callback(err);
              if (!mount.opts.disabled) {
                CLOUDFS.syncfs_save_to_cloud(mount, callback);
              } else {
                callback(null);
              }
            });
          }