simple_sort.cu is not working in revision r648

```
Testcases fails with flowing errors:

Using device 0: GeForce 8800 GTS 512
Simple key-value sort: INCORRECT: [0]: 102400 != 4128
Small-problem key-value sort: INCORRECT: [0]: 102400 != 4128
Small-problem restricted-range key-value sort: INCORRECT: [0]: 47840 != 4128
```

Original issue reported on code.google.com by `Ilya.Gre...@gmail.com` on 18 Aug 2011 at 6:05
