For the callback functions invoked by the virtio-serial-bus code, check if we have chardev backends registered before we call into the chardev functions. Signed-off-by: Amit Shah <amit.shah@redhat.com> Reported-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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