ipe: Add missing terminator to list of unit tests

Add missing terminator to list of unit tests to avoid random crashes seen
when running the test.

Fixes: 10ca05a7 ("ipe: kunit test for parser")
Cc: Deven Bowers <deven.desai@linux.microsoft.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Fan Wu <wufan@linux.microsoft.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Fan Wu <wufan@linux.microsoft.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/ipe/policy_tests.c

@@ -286,6 +286,7 @@ static void ipe_parser_widestring_test(struct kunit *test)
 static struct kunit_case ipe_parser_test_cases[] = {
 	KUNIT_CASE_PARAM(ipe_parser_unsigned_test, ipe_policies_gen_params),
 	KUNIT_CASE(ipe_parser_widestring_test),
+	{ }
 };
 
 static struct kunit_suite ipe_parser_test_suite = {