removed lead of ndb eventoperations on ndb object delete

NdbEventBuffer::~NdbEventBuffer()

{

  // todo lock?  what if receive thread writes here?

  NdbEventOperationImpl* op= m_dropped_ev_op;  

  while ((op = m_dropped_ev_op))

  {

    m_dropped_ev_op = m_dropped_ev_op->m_next;

    delete op->m_facade;

  }

  for (unsigned j= 0; j < m_allocated_data.size(); j++)

  {

    unsigned sz= m_allocated_data[j]->sz;