selftests: drv-net: rss_ctx: add missing cleanup in queue reconfigure

Commit under Fixes adds ntuple rules but never deletes them.

Fixes: 29a4bc1 ("selftest: extend test_rss_context_queue_reconfigure for action addition")
Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20250201013040.725123-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/drivers/net/hw/rss_ctx.py

@@ -252,6 +252,7 @@ def test_rss_queue_reconfigure(cfg, main_ctx=True):
         try:
             # this targets queue 4, which doesn't exist
             ntuple2 = ethtool_create(cfg, "-N", flow)
+            defer(ethtool, f"-N {cfg.ifname} delete {ntuple2}")
         except CmdExitFailure:
             pass
         else:
@@ -260,6 +261,7 @@ def test_rss_queue_reconfigure(cfg, main_ctx=True):
         ethtool(f"-X {cfg.ifname} {ctx_ref} weight 1 0 1 0")
         # ntuple rule therefore targets queues 1 and 3
         ntuple2 = ethtool_create(cfg, "-N", flow)
+        defer(ethtool, f"-N {cfg.ifname} delete {ntuple2}")
         # should replace existing filter
         ksft_eq(ntuple, ntuple2)
         _send_traffic_check(cfg, port, ctx_ref, { 'target': (1, 3),