PVS-Studio warning V519 for UltimateTCPIP

int CUH_Control::SetHistoryLength(int len){
  ...
  prev = m_HLEndPosPtr->m_prev;
  prev = m_HLEndPosPtr->m_next = NULL;
  ...
}

This suspicious code was found in UltimateTCPIP project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'prev' object is assigned values twice successively. Perhaps this is a mistake. UTHistory uh_ctrl.cpp 787

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/