Implements hook_node_type_delete().
function comment_node_type_delete($info) {
field_attach_delete_bundle('comment', 'comment_node_' . $info->type);
$settings = array(
'comment',
'comment_default_mode',
'comment_default_per_page',
'comment_anonymous',
'comment_subject_field',
'comment_preview',
'comment_form_location',
);
foreach ($settings as $setting) {
variable_del($setting . '_' . $info->type);
}
}