virtio-scsi: Fix memory leak when realize failed

Signed-off-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/scsi/virtio-scsi.c

@@ -808,6 +808,7 @@ void virtio_scsi_common_realize(DeviceState *dev, Error **errp,
         error_setg(errp, "Invalid number of queues (= %" PRId32 "), "
                          "must be a positive integer less than %d.",
                    s->conf.num_queues, VIRTIO_PCI_QUEUE_MAX);
+        virtio_cleanup(vdev);
         return;
     }
     s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *));