bbp_check_topic_edit()

function bbp_check_topic_edit() {

	// Bail if not editing a topic
	if ( !bbp_is_topic_edit() )
		return;

	// User cannot edit topic, so redirect back to topic
	if ( !current_user_can( 'edit_topic', bbp_get_topic_id() ) ) {
		wp_safe_redirect( bbp_get_topic_permalink() );
		exit();
	}
}