landlock: Remove KUnit test that triggers a warning

A KUnit test checking boundaries triggers a canary warning, which may be
disturbing.  Let's remove this test for now.  Hopefully, KUnit will soon
get support for suppressing warning backtraces [1].

Cc: Alessandro Carminati <acarmina@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Günther Noack <gnoack@google.com>
Reported-by: Tingmao Wang <m@maowtm.org>
Closes: https://lore.kernel.org/r/20250327213807.12964-1-m@maowtm.org
Link: https://lore.kernel.org/r/20250425193249.78b45d2589575c15f483c3d8@linux-foundation.org [1]
Link: https://lore.kernel.org/r/20250503065359.3625407-1-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

Author: l0kod

security/landlock/audit.c

@@ -175,7 +175,7 @@ static void test_get_hierarchy(struct kunit *const test)
 	KUNIT_EXPECT_EQ(test, 10, get_hierarchy(&dom2, 0)->id);
 	KUNIT_EXPECT_EQ(test, 20, get_hierarchy(&dom2, 1)->id);
 	KUNIT_EXPECT_EQ(test, 30, get_hierarchy(&dom2, 2)->id);
-	KUNIT_EXPECT_EQ(test, 30, get_hierarchy(&dom2, -1)->id);
+	/* KUNIT_EXPECT_EQ(test, 30, get_hierarchy(&dom2, -1)->id); */
 }
 
 #endif /* CONFIG_SECURITY_LANDLOCK_KUNIT_TEST */