ROM_Cache is array or just pointer?

Compiling error:
3DNES/source/main.c:52:12: error: assignment to expression with array type
  ROM_Cache    = NULL;

main.c:

```
if (ROM_Cache != NULL)
    linearFree (ROM_Cache);
```

While it's defined as array in FileSystem.c:

```
u8  ROM_Cache[MAX_ROM_SIZE];
```

and nesGlobal.h:

```
extern u8                   ROM_Cache[MAX_ROM_SIZE];
```

Some files are not commited?
