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

[EG Galano]

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diff --git a/dlls/gdiplus/tests/pathiterator.c b/dlls/gdiplus/tests/pathiterator.c
index 3e1c287..17cd463 100644
--- a/dlls/gdiplus/tests/pathiterator.c
+++ b/dlls/gdiplus/tests/pathiterator.c
@@ -124,6 +124,7 @@ static void test_nextmarker(void)
     expect(4, result);
     start = end = result = (INT)0xdeadbeef;
     stat = GdipPathIterNextMarker(iter, &result, &start, &end);
+    expect(Ok, stat);
     /* start/end remain unchanged */
     expect((INT)0xdeadbeef, start);
     expect((INT)0xdeadbeef, end);