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

io_uring/rsrc.h

@@ -57,7 +57,6 @@ struct io_mapped_ubuf {
 	struct bio_vec	bvec[];
 };
 
-void io_rsrc_put_tw(struct callback_head *cb);
 void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
 void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
 struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);