usp10/tests: remove dead assignment (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/usp10/tests/usp10.c b/dlls/usp10/tests/usp10.c
index 109b1db..a64f4db 100644
--- a/dlls/usp10/tests/usp10.c
+++ b/dlls/usp10/tests/usp10.c
@@ -838,7 +838,6 @@ static void test_ScriptTextOut(HDC hdc)
     /* It would appear that we have a valid SCRIPT_ANALYSIS and can continue
      * ie. ScriptItemize has succeeded and that pItem has been set                            */
     cInChars = 5;
-    cMaxItems = 255;
     if (hr == 0) {
         psc = NULL;                                   /* must be null on first call           */
         cChars = cInChars;