ntdll/tests: make sure return value is used (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/ntdll/tests/reg.c b/dlls/ntdll/tests/reg.c
index 1cad29e..8f44a1d 100644
--- a/dlls/ntdll/tests/reg.c
+++ b/dlls/ntdll/tests/reg.c
@@ -637,6 +637,7 @@ static void test_NtDeleteKey(void)
 
     InitializeObjectAttributes(&attr, &winetestpath, 0, 0, 0);
     status = pNtOpenKey(&hkey, am, &attr);
+    ok(status == STATUS_SUCCESS, "NtOpenKey Failed: 0x%08x\n", status);
 
     status = pNtDeleteKey(hkey);
     ok(status == STATUS_SUCCESS, "NtDeleteKey Failed: 0x%08x\n", status);