gdi32/tests: make sure to use return value (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/gdi32/tests/path.c b/dlls/gdi32/tests/path.c
index 9fe6f43..4b061f9 100644
--- a/dlls/gdi32/tests/path.c
+++ b/dlls/gdi32/tests/path.c
@@ -89,6 +89,7 @@ static void test_widenpath(void)
     Polyline(hdc, pnt, 6);
     EndPath(hdc);
     ret = WidenPath(hdc);
+    ok(ret == TRUE, "WidenPath failed: %d", GetLastError());
     nSize = GetPath(hdc, NULL, NULL, 0);
     ok(nSize > 6, "WidenPath should compute a widdened path with a 1px wide pen. Path length is %d, should be more than 6\n", nSize);