test/link-timeout: close pipes after yourself

Close pipe fds when we exit test_single_link_timeout().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/test/link-timeout.c b/test/link-timeout.c
index a517c5e..5d8417f 100644
--- a/test/link-timeout.c
+++ b/test/link-timeout.c
@@ -528,6 +528,8 @@
 		io_uring_cqe_seen(ring, cqe);
 	}
 
+	close(fds[0]);
+	close(fds[1]);
 	return 0;
 err:
 	return 1;