selftests: reuseaddr_conflict: add missing new line at the end of the output

commit-author Jakub Kicinski <kuba@kernel.org>
commit 3197412

The netdev CI runs in a VM and captures serial, so stdout and
stderr get combined. Because there's a missing new line in
stderr the test ends up corrupting KTAP:

  # Successok 1 selftests: net: reuseaddr_conflict

which should have been:

  # Success
  ok 1 selftests: net: reuseaddr_conflict

Fixes: 422d8dc ("selftest: add a reuseaddr test")
        Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Link: https://lore.kernel.org/r/20240329160559.249476-1-kuba@kernel.org
        Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 3197412)
        Signed-off-by: Marcin Wcisło <marcin.wcislo@conclusive.pl>

Author: kuba-moo

tools/testing/selftests/net/reuseaddr_conflict.c

@@ -109,6 +109,6 @@ int main(void)
 	fd1 = open_port(0, 1);
 	if (fd1 >= 0)
 		error(1, 0, "Was allowed to create an ipv4 reuseport on an already bound non-reuseport socket with no ipv6");
-	fprintf(stderr, "Success");
+	fprintf(stderr, "Success\n");
 	return 0;
 }