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			PCIBus registers a vmstate during init. Unregister it upon removal/unplug. Signed-off-by: Bandan Das <bsd@redhat.com> Cc: qemu-stable@nongnu.org Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>