Missing return for function userpoints_get_default_tid()

Hi,

I found a bug in the code (line ~1785)
function userpoints_get_default_tid() doesn't retun anything. (missing return).

replace

/*
 * Wrapper function to return the default tid via API call
 */
function userpoints_get_default_tid() {
  variable_get(USERPOINTS_CATEGORY_DEFAULT_TID, NULL);
}

with

/*
 * Wrapper function to return the default tid via API call
 */
function userpoints_get_default_tid() {
  return variable_get(USERPOINTS_CATEGORY_DEFAULT_TID, NULL);
}