PVS-Studio warning V595 for MongoDB

void ReplSetImpl::setSelfTo(Member *m) {
  // already locked in initFromConfig
  _self = m;
  _id = m->id();
  _config = m->config();
  if( m ) _buildIndexes = m->config().buildIndexes;
  else _buildIndexes = true;
}

This suspicious code was found in MongoDB project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'm' pointer was utilized before it was verified against nullptr. Check lines: 402, 404. rs.cpp 402

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/