PVS-Studio warning V514 for OpenCOLLADA

struct ObjectGroups{
  componentList objectGrpCompList;
  int objectGroupId;
  short objectGrpColor;
  void write(FILE* file) const;
}* objectGroups;

void write(FILE* file) const
{
  size_t size = sizeof(objectGroups)/sizeof(ObjectGroups);
  for(size_t i=0; i<size; ++i)
  {
    objectGroups[i].write(file);
    if(i+1<size) fprintf(file," ");
  }
}

This suspicious code was found in OpenCOLLADA project by PVS-Studio static code analyzer.
Warning message is:
V514 Dividing sizeof a pointer 'sizeof (objectGroups)' by another value. There is a probability of logical error presence. mayadmdagnode.h 40

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