xen_console: ignore console disconnect events from console/0
The first console has a different location compared to other PV devices
(console, rather than device/console/0) and doesn't obey the xenstore
state protocol. We already special case the first console in con_init
and con_initialise, we should also do it in con_disconnect.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
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