net: hns: modify variable type in hns_nic_reuse_page

'truesize' is supposed to be u32, not int, so fix it.

Signed-off-by: Huazhong tan <tanhuazhong@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>