Function dr_unregister_end_trace_event 

pub unsafe extern "C" fn dr_unregister_end_trace_event(
    func: Option<unsafe extern "C" fn(drcontext: *mut c_void, tag: *mut c_void, next_tag: *mut c_void) -> dr_custom_trace_action_t>,
) -> bool_

Unregister a callback function for the end-trace event. \return true if unregistration is successful and false if it is not (e.g., \p func was not registered).