selftests: Fix the if conditions of in test_extra_filter()

selftests: Fix the if conditions of in test_extra_filter()

[ Upstream commit b29c229a74237dd7bbf47bf8dc10ae22ec18ae33 ]

The socket 2 bind the addr in use, bind should fail with EADDRINUSE. So
if bind success or errno != EADDRINUSE, testcase should be failed.

Fixes: e102736317c7 ("soreuseport: BPF selection functional test")
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
Link: https://lore.kernel.org/r/1663916557-10730-1-git-send-email-wangyufen@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>