Without this do_close() I get "Couldn't get handle: Failure"
on every operation after N times through this failure path
where N = 100 on OpenBSD and N = 200 on GNU/Linux.
--- src/usr.bin/ssh/sftp-client.c.orig	Sun Sep 16 00:55:52 2007
+++ src/usr.bin/ssh/sftp-client.c	Mon Oct 15 10:12:50 2007
@@ -813,6 +813,7 @@ do_download(struct sftp_conn *conn, char
 	if (local_fd == -1) {
 		error("Couldn't open local file \"%s\" for writing: %s",
 		    local_path, strerror(errno));
+		do_close(conn, handle, handle_len);
 		buffer_free(&msg);
 		xfree(handle);
 		return(-1);