wintrust/tests: make sure return values are used (LLVM/Clang) (3/4)

[Juan Lang]

Hey Austin,

     ok(ret, "WintrustSetRegPolicyFlags failed: %d\n", GetLastError());
     size = sizeof(flags1);
     r = RegQueryValueExA(key, State, NULL, NULL, (LPBYTE)&flags1, &size);
-    ok(flags1 == flags3, "Got %08x flags instead of %08x\n", flags1, flags3);
+    ok(!r || r == ERROR_FILE_NOT_FOUND, "RegQueryValueEx failed: %d\n", r);
+    if (!r)
+        ok(flags1 == flags3, "Got %08x flags instead of %08x\n",
flags1, flags3);

It seems to me that the introduction of ERROR_FILE_NOT_FOUND weakens
the test.  (Testing r should be done, thanks for fixing that.)  I
assume that, since WintrustSetRegPolicyFlags should have succeeded,
the registry value should now exist.  Is there a test failure you're
also trying to fix?

Thanks,
--Juan