if (!aFocusNode || !mAnchorFocusRange)
if (!aFocusNode)
nsDOMSelection::GetFocusNode(nsIDOMNode** aFocusNode){	if (!aFocusNode || !mAnchorFocusRange)		return NS_ERROR_NULL_POINTER;  nsresult result;  if (GetDirection() == eDirNext){    result = mAnchorFocusRange->GetEndContainer(aFocusNode);  }  else{    result = mAnchorFocusRange->GetStartContainer(aFocusNode);  }	return result;}