io_uring/rsrc: Remove unused declaration io_rsrc_put_tw()

Commit 36b9818a ("io_uring/rsrc: don't offload node free")
removed the implementation but leave declaration.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20230808151058.4572-1-yuehaibing@huawei.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>