src: add json support for last statement

This patch adds json support for the last statement, it works for me here.

However, tests/py still displays a warning:

any/last.t: WARNING: line 12: '{"nftables": [{"add": {"rule": {"family": "ip", "table": "test-ip4", "chain": "input", "expr": [{"last": {"used": 300000}}]}}}]}': '[{"last": {"used": 300000}}]' mismatches '[{"last": null}]'

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/py/any/last.t.json b/tests/py/any/last.t.json
new file mode 100644
index 00000000..2a2b9e72
--- /dev/null
+++ b/tests/py/any/last.t.json
@@ -0,0 +1,16 @@
+# last
+[
+    {
+        "last": null
+    }
+]
+
+# last used 300s
+[
+    {
+        "last": {
+		"used": 300000
+	}
+    }
+]
+