Remove unnecessary device_ptr_cast()
Remove unnecessary device_ptr_cast()

xiongzhanblake/code-samples,MMp131316/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,MMp131316/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,xiongzhanblake/code-samples,MMp131316/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,MMp131316/code-samples,xiongzhanblake/code-samples,xiongzhanblake/code-samples