qom: if @instance_size==0, assign size of object to parent object size
QOM documentation states that for objects of type with @instance_size == 0 size will be assigned to match parent object's size. But currently this feauture is not implemented and qemu asserts during creation of object with zero instance_size. Set appropriate value for type instance_size during type_class_init() call. object_initialize_with_type() must call type_class_init() before asserting type->instance_size, and object_new_with_type() must call type_class_init() before object allocation. Signed-off-by: NIgor Mitsyanko <i.mitsyanko@samsung.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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