Access Violation exception when filling an array element


```lua
cffi.cdef([[
  struct A {
    int a;
    int b;
  };
]])

array = cffi.new("struct A[10]", {})
element = array[4]
cffi.fill(element, cffi.sizeof("struct A"), 0) -- access violation
```
To avoid this, I have to use `cffi.addressof`:
```lua
cffi.fill(cffi.addressof(element), cffi.sizeof("struct A"), 0) -- no access violation
```



Windows 11, lua x86 5.4.6