[PATCH v1 12/16] qapi: fix example of blockdev-add command

[Victor Toso]

The example output is setting optional member "backing" with null.
This has no runtime impact. Remove it.

Problem was noticed when using the example as a test case for Go
bindings.

Signed-off-by: Victor Toso <victortoso@redhat.com>
---
 qapi/block-core.json | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index dcc6d41494..302164d575 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1542,9 +1542,7 @@
 #      "arguments": { "driver": "qcow2",
 #                     "node-name": "node1534",
 #                     "data-file": { "driver": "file",
-#                                    "filename": "hd1.qcow2" },
-#                     "backing": null } }
-#
+#                                    "filename": "hd1.qcow2" } } }
 # <- { "return": {} }
 #
 # -> { "execute": "blockdev-snapshot",
-- 
2.37.2