ospf6d: Fix memory leak for `show ipv6 ospf6 zebra json`

$ for x in $(seq 1 10000); do vtysh -c 'show ipv6 ospf6 zebra json' >/dev/null; done

Before:
```
$ vtysh -c 'show memory ospf6d' | grep 'Total heap allocated'
  Total heap allocated:  26 MiB
```

After:
```
$ vtysh -c 'show memory ospf6d' | grep 'Total heap allocated'
  Total heap allocated:  2256 KiB
```

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>

diff --git a/ospf6d/ospf6_zebra.c b/ospf6d/ospf6_zebra.c
index b8186335183e64a97655ff743dccdc1bcce92972..82d280811bfcf54274a01a6907f4db6d9c43bda2 100644 (file)
--- a/ospf6d/ospf6_zebra.c
+++ b/ospf6d/ospf6_zebra.c
@@ -352,9 +352,7 @@ DEFUN(show_zebra,
                json_object_object_add(json_zebra, "redistribute", json_array);
                json_object_object_add(json, "zebraInformation", json_zebra);
 
-               vty_out(vty, "%s\n",
-                       json_object_to_json_string_ext(
-                               json, JSON_C_TO_STRING_PRETTY));
+               vty_json(vty, json);
        } else {
                vty_out(vty, "Zebra Infomation\n");
                vty_out(vty, "  fail: %d\n", zclient->fail);