qdev: Check if unplug handler exists before calling it
A bus may have hotplugging enabled but not have the 'unplug' callback defined, which would lead to a crash on trying to unplug a device on the bus. Fix by introducing an assert to check if the callback is valid. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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