vhost-user-fs: do delete virtio_queues in unrealize

Similar to other virtio device(https://patchwork.kernel.org/patch/11399237/), virtio queues forgot to delete in unrealize, and aslo error path in realize, this patch fix these memleaks, the leak stack is as follow:
Direct leak of 57344 byte(s) in 1 object(s) allocated from:
    #0 0x7f15784fb970 in __interceptor_calloc (/lib64/libasan.so.5+0xef970)
    #1 0x7f157790849d in g_malloc0 (/lib64/libglib-2.0.so.0+0x5249d)
    #2 0x55587a1bf859 in virtio_add_queue /mnt/sdb/qemu-new/qemu_test/qemu/hw/virtio/virtio.c:2333
    #3 0x55587a2071d5 in vuf_device_realize /mnt/sdb/qemu-new/qemu_test/qemu/hw/virtio/vhost-user-fs.c:212
    #4 0x55587a1ae360 in virtio_device_realize /mnt/sdb/qemu-new/qemu_test/qemu/hw/virtio/virtio.c:3531
    #5 0x55587a63fb7b in device_set_realized /mnt/sdb/qemu-new/qemu_test/qemu/hw/core/qdev.c:891
    #6 0x55587acf03f5 in property_set_bool /mnt/sdb/qemu-new/qemu_test/qemu/qom/object.c:2238
    #7 0x55587acfce0d in object_property_set_qobject /mnt/sdb/qemu-new/qemu_test/qemu/qom/qom-qobject.c:26
    #8 0x55587acf5c8c in object_property_set_bool /mnt/sdb/qemu-new/qemu_test/qemu/qom/object.c:1390
    #9 0x55587a8e22a2 in pci_qdev_realize /mnt/sdb/qemu-new/qemu_test/qemu/hw/pci/pci.c:2095
    #10 0x55587a63fb7b in device_set_realized /mnt/sdb/qemu-new/qemu_test/qemu/hw/core/qdev.c:891
    #11 0x55587acf03f5 in property_set_bool /mnt/sdb/qemu-new/qemu_test/qemu/qom/object.c:2238
    #12 0x55587acfce0d in object_property_set_qobject /mnt/sdb/qemu-new/qemu_test/qemu/qom/qom-qobject.c:26
    #13 0x55587acf5c8c in object_property_set_bool /mnt/sdb/qemu-new/qemu_test/qemu/qom/object.c:1390
    #14 0x55587a496d65 in qdev_device_add /mnt/sdb/qemu-new/qemu_test/qemu/qdev-monitor.c:679

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200225075554.10835-2-pannengyuan@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/virtio/vhost-user-fs.c

@@ -230,6 +230,10 @@ static void vuf_device_realize(DeviceState *dev, Error **errp)
 
 err_virtio:
     vhost_user_cleanup(&fs->vhost_user);
+    virtio_del_queue(vdev, 0);
+    for (i = 0; i < fs->conf.num_request_queues; i++) {
+        virtio_del_queue(vdev, i + 1);
+    }
     virtio_cleanup(vdev);
     g_free(fs->vhost_dev.vqs);
     return;
@@ -239,6 +243,7 @@ static void vuf_device_unrealize(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserFS *fs = VHOST_USER_FS(dev);
+    int i;
 
     /* This will stop vhost backend if appropriate. */
     vuf_set_status(vdev, 0);
@@ -247,6 +252,10 @@ static void vuf_device_unrealize(DeviceState *dev, Error **errp)
 
     vhost_user_cleanup(&fs->vhost_user);
 
+    virtio_del_queue(vdev, 0);
+    for (i = 0; i < fs->conf.num_request_queues; i++) {
+        virtio_del_queue(vdev, i + 1);
+    }
     virtio_cleanup(vdev);
     g_free(fs->vhost_dev.vqs);
     fs->vhost_dev.vqs = NULL;