mmdevapi/tests: remove a dead assignment (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/mmdevapi/tests/render.c b/dlls/mmdevapi/tests/render.c
index 4274e83..ce5247d 100644
--- a/dlls/mmdevapi/tests/render.c
+++ b/dlls/mmdevapi/tests/render.c
@@ -571,7 +571,6 @@ static void test_clock(void)
     ok(hr == S_OK, "GetPosition failed: %08x\n", hr);
     ok(pos == 0, "GetPosition returned non-zero pos before being started\n");
     ok(pcpos != 0, "GetPosition returned zero pcpos\n");
-    last = pos;
 
     hr = IAudioClient_GetService(ac, &IID_IAudioRenderClient, (void**)&arc);
     ok(hr == S_OK, "GetService(IAudioRenderClient) failed: %08x\n", hr);