io_uring/net: fix zc send link failing

Failed requests should be marked with req_set_fail(), so links and cqe
skipping work correctly, which is missing in io_sendzc(). Note,
io_sendzc() return IOU_OK on failure, so the core code won't do the
cleanup for us.

Fixes: 06a5464 ("io_uring: wire send zc request type")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e47d46fda9db30154ce66a549bb0d3380b780520.1661342812.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/net.c

@@ -1023,6 +1023,7 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
+		req_set_fail(req);
 	} else if (zc->flags & IORING_RECVSEND_NOTIF_FLUSH) {
 		io_notif_slot_flush_submit(notif_slot, 0);
 	}