qdev-monitor: Avoid device_add crashing on non-device driver name
Watch this: $ upstream-qemu -nodefaults -S -display none -monitor stdio QEMU 1.7.50 monitor - type 'help' for more information (qemu) device_add rng-egd /work/armbru/qemu/qdev-monitor.c:491:qdev_device_add: Object 0x2089b00 is not an instance of type device Aborted (core dumped) Crashes because "rng-egd" exists, but isn't a subtype of TYPE_DEVICE. Broken in commit 18b6dade. Cc: qemu-stable@nongnu.org Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NAndreas Färber <afaerber@suse.de>
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