qom: object: move unparenting to the child property's release callback
This ensures that the unparent callback is called automatically when the parent object is finalized. Note that there's no need to keep a reference neither in object_unparent nor in object_finalize_child_property. The reference held by the child property itself will do. Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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