tests: py: fix inet/ip_tcp.t test

Contrary to the comment and expected output, nft does _not_ eliminate
the redundant `ip protocol` expression from the second test.  Dependency
elimination requires a higher level expression.  `ip saddr` cannot lead
to the elimination of `ip protocol` since they are both L3 expressions.
`tcp dport` cannot because although `ip saddr` and `ip protocol` both
imply that the L3 protocol is `ip`, only protocol matches are stored as
dependencies, so the redundancy is not apparent, and in fact,
`payload_may_dependency_kill` explicitly checks for the combination of
inet, bridge or netdev family, L4 expression and L3 ipv4 or ipv6
dependency and returns false.

Correct the expected output and comment.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/py/inet/ip_tcp.t.json.output b/tests/py/inet/ip_tcp.t.json.output
index 4a6a05d7..acad8b1f 100644
--- a/tests/py/inet/ip_tcp.t.json.output
+++ b/tests/py/inet/ip_tcp.t.json.output
@@ -32,6 +32,18 @@
         "match": {
             "left": {
                 "payload": {
+                    "field": "protocol",
+                    "protocol": "ip"
+                }
+            },
+	    "op": "==",
+            "right": 6
+        }
+    },
+    {
+        "match": {
+            "left": {
+                "payload": {
                     "field": "saddr",
                     "protocol": "ip"
                 }