#10 Minor default initialization to keep linting tools happy.

[Ryan Henderson]

659a660,661

        , m_name_size(0)
        , m_value_size(0)

810a813
: m_prev_attribute(0), m_next_attribute(0)
903a907
, m_last_node(0)
904a909,911
, m_last_attribute(0)
, m_prev_sibling(0)
, m_next_sibling(0)