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

[Austin English]

-- 
-Austin
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diff --git a/dlls/jscript/tests/run.c b/dlls/jscript/tests/run.c
index 326b327..18252be 100644
--- a/dlls/jscript/tests/run.c
+++ b/dlls/jscript/tests/run.c
@@ -1276,7 +1276,7 @@ static void run_from_res(const char *name)
 
     len = MultiByteToWideChar(CP_ACP, 0, data, size, NULL, 0);
     str = SysAllocStringLen(NULL, len);
-    len = MultiByteToWideChar(CP_ACP, 0, data, size, str, len);
+    MultiByteToWideChar(CP_ACP, 0, data, size, str, len);
 
     SET_EXPECT(global_success_d);
     SET_EXPECT(global_success_i);