io_uring/zcrx: kill dead 'sock' member in struct io_zcrx_args

This member is only ever assigned, never read. Kill it.

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

io_uring/zcrx.c

@@ -339,7 +339,6 @@ static void zcrx_sync_for_device(struct page_pool *pp, struct io_zcrx_ifq *zcrx,
 struct io_zcrx_args {
 	struct io_kiocb		*req;
 	struct io_zcrx_ifq	*ifq;
-	struct socket		*sock;
 	unsigned		nr_skbs;
 };
 
@@ -1733,7 +1732,6 @@ static int io_zcrx_tcp_recvmsg(struct io_kiocb *req, struct io_zcrx_ifq *ifq,
 	struct io_zcrx_args args = {
 		.req = req,
 		.ifq = ifq,
-		.sock = sk->sk_socket,
 	};
 	read_descriptor_t rd_desc = {
 		.count = len ? len : UINT_MAX,