dinput8/tests: make sure to use return value (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/dinput8/tests/device.c b/dlls/dinput8/tests/device.c
index 31e2e3f..363a34e 100644
--- a/dlls/dinput8/tests/device.c
+++ b/dlls/dinput8/tests/device.c
@@ -81,6 +81,7 @@ static void test_device_input(
 
     IDirectInputDevice8_Poll(lpdid);
     hr = IDirectInputDevice8_GetDeviceData(lpdid, sizeof(obj_data), &obj_data, &data_size, 0);
+    ok (SUCCEEDED(hr), "IDirectInputDevice8_GetDeviceData failed, hr=%08x\n", hr);
 
     if (data_size != 1)
     {