PVS-Studio warning V559 for Miranda IM

int __cdecl CIcqProto::FileCancel( ... )
{
  ...
  if (dwUin && ft->ft_magic == FT_MAGIC_ICQ)
  {
    ...
  }
  else if (ft->ft_magic = FT_MAGIC_OSCAR)
  {
    ...
  }
  ...
}

This is what should have been written here: else if (ft->ft_magic == FT_MAGIC_OSCAR)

This suspicious code was found in Miranda IM project by PVS-Studio static code analyzer.
Warning message is:
V559 Suspicious assignment inside the condition expression of 'if' operator: ft->ft_magic = 0x4F. icqoscar8 icq_proto.cpp 666

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/