selftests: net: fix counting totals when some checks fail

Totals currently only pay attention to exceptions, if check fails
(say ksft_eq()) the test case will be counted as pass:

  # At /ksft/drivers/net/./ping.py line 18:
  # Check failed 1 != 2
  not ok 1 ping.test_v4
  ok 2 ping.test_v6
  ok 3 ping.test_tcp
  # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
            ^^^^^^^^^^^^^

Pay attention to the result.

Fixes: b86761ff ("selftests: net: add scaffolding for Netlink tests in Python")
Link: https://lore.kernel.org/r/20240417231146.2435572-2-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>