Test that SipHash_Final() fails on uninited context

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18142)
diff --git a/test/siphash_internal_test.c b/test/siphash_internal_test.c
index 03824ea..7626bab 100644
--- a/test/siphash_internal_test.c
+++ b/test/siphash_internal_test.c
@@ -262,8 +262,10 @@
 
     /* Use invalid hash size */
     return TEST_int_eq(SipHash_set_hash_size(&siphash, 4), 0)
+           && TEST_false(SipHash_Final(&siphash, output, 0))
            /* Use hash size = 8 */
            && TEST_true(SipHash_set_hash_size(&siphash, 8))
+           && TEST_false(SipHash_Final(&siphash, output, 8))
            && TEST_true(SipHash_Init(&siphash, key, 0, 0))
            && TEST_true(SipHash_Final(&siphash, output, 8))
            && TEST_int_eq(SipHash_Final(&siphash, output, 16), 0)