This commit removes the QemuConsole from the global "consoles" list when
it is finalized, fixing use-after-free on throw-away objects.
Reproducer: QMP command qom-list-properties with typename
"qemu-text-console", "qemu-fixed-text-console" or
"qemu-graphic-console".
The assertions added ensure that `dcls`, `gl_block`, and the
`dump_queue` are empty before removal, confirming the console is in a
clean state. This is left to handle correctly in a future series for
hot-unplug case.
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
dc5d5800f8