block: Reset device model callbacks on detach
BlockDriverState members change_cb and change_opaque are initially null. The device model may set them, with bdrv_set_change_cb(). If the device model gets detached (hot unplug), they're left dangling. Only safe because device hot unplug automatically destroys the BlockDriverState. But that's a questionable feature, best not to rely on it. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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