comctl32/tests: make sure to use a return value (LLVM/Clang) (6/6)

[Austin English]

-- 
-Austin
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diff --git a/dlls/comctl32/tests/updown.c b/dlls/comctl32/tests/updown.c
index 859b3a0..f10e469 100644
--- a/dlls/comctl32/tests/updown.c
+++ b/dlls/comctl32/tests/updown.c
@@ -406,6 +406,7 @@ static void test_updown_pos32(void)
 
     low = high = -1;
     r = SendMessage(updown, UDM_GETRANGE32, (WPARAM) &low , (LPARAM) &high );
+    expect(0,r);
     if (low == -1)
     {
         win_skip("UDM_SETRANGE32/UDM_GETRANGE32 not available\n");