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

[Austin English]

-- 
-Austin
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diff --git a/dlls/wintrust/tests/register.c b/dlls/wintrust/tests/register.c
index dd266bd..acd5ca1 100644
--- a/dlls/wintrust/tests/register.c
+++ b/dlls/wintrust/tests/register.c
@@ -299,7 +299,9 @@ static void test_RegPolicyFlags(void)
     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);
 
     pWintrustSetRegPolicyFlags(flags2);