d3dxof: Avoid undefined behavior in parse_object_parts.

[Thomas Faber]

MSVC compiles
  buf->pxo = buf->pxo->children[buf->pxo->nb_children] = &buf->pxo_tab[buf->pxo->root->nb_subobjects++];
to:
  buf->pxo = buf->pxo->children[buf->pxo->nb_children] = &buf->pxo_tab[buf->pxo->root->nb_subobjects];
  buf->pxo->root->nb_subobjects++
which means it will try to use the new pxo, whose root pointer
is uninitialized.
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