21:/std/callout.c (/std/callout.c)
(int) remove_call_out(string func)
/*
 * Function name: remove_call_out
 * Description:   Locate and remove a call_out to a named function
 * Arguments:     func - name of function the call_out is for
 * Returns:       -1 if not found, time that remained before trigger
 *                would be done if found
 */
