selftests: drv-net: rss: Fix error calculation in test_hitless_key_update
This test verifies there are no errors when a devices RSS key is updated
while traffic is flowing. The current check is a no-op since the last
sample was subtracted from itself.
Signed-off-by: Dimitri Daskalakis <dimitri.daskalakis1@gmail.com>
Link: https://patch.msgid.link/20260303202258.1595661-1-dimitri.daskalakis1@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
authored by