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: 10ca05a76065 ("ipe: kunit test for parser")
Cc: Deven Bowers <[e-mail]>
Cc: Paul Moore <[e-mail]>
Cc: Fan Wu <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Acked-by: Fan Wu <[e-mail]>
Signed-off-by: Paul Moore <[e-mail]>

security/ipe/policy_tests.c

···
 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 = {