unit-tests: Fix memory leak in ntru tests

src/libstrongswan/tests/suites/test_ntru.c

@@ -1171,6 +1171,8 @@ START_TEST(test_ntru_privkey)
 	chunk_free(&encoding);
 	privkey->destroy(privkey);
 	pubkey->destroy(pubkey);
+	drbg->destroy(drbg);
+	entropy->destroy(entropy);
 }
 END_TEST