9pfs: fix crash when fsdev is missing
If the user passes -device virtio-9p without the corresponding -fsdev, QEMU dereferences a NULL pointer and crashes. This is a 2.8 regression introduced by commit 702dbcc2. Signed-off-by: NGreg Kurz <groug@kaod.org> Reviewed-by: NLi Qiang <liq3ea@gmail.com>
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