[Buildroot] [git commit branch/2025.08.x] package/rdesktop: fix build error

[Thomas Perale]

commit: https://git.buildroot.net/buildroot/commit/?id=83a77ac5564c5a38f79bc1e41f07eac918aefbdc
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2025.08.x

Fixes:
https://autobuild.buildroot.net/results/8ad/8ad5d33f726fe57910a70df7c8f40a9568c2dfa7/

Signed-off-by: Bernd Kuhls <bernd at kuhls.net>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
(cherry picked from commit 7bd818a06726b3bde02282bb9ae382a8e3af93be)
Signed-off-by: Thomas Perale <thomas.perale at mind.be>
---
 .../0002-use-correct-modulus-and-exponent.patch    | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/package/rdesktop/0002-use-correct-modulus-and-exponent.patch b/package/rdesktop/0002-use-correct-modulus-and-exponent.patch
new file mode 100644
index 0000000000..f6989d5777
--- /dev/null
+++ b/package/rdesktop/0002-use-correct-modulus-and-exponent.patch
@@ -0,0 +1,29 @@
+From 53ba87dc174175e98332e22355ad8662c02880d6 Mon Sep 17 00:00:00 2001
+From: Markus Beth <markus.beth at zkrd.de>
+Date: Mon, 2 Dec 2019 11:22:13 +0100
+Subject: [PATCH] use correct modulus and exponent in rdssl_rkey_get_exp_mod
+
+Upstream: https://github.com/rdesktop/rdesktop/commit/53ba87dc174175e98332e22355ad8662c02880d6
+
+Signed-off-by: Bernd Kuhls <bernd at kuhls.net>
+---
+ ssl.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/ssl.c b/ssl.c
+index 930c7f94..0681a890 100644
+--- a/ssl.c
++++ b/ssl.c
+@@ -307,10 +307,10 @@ rdssl_rkey_get_exp_mod(RDSSL_RKEY * rkey, uint8 * exponent, uint32 max_exp_len,
+ {
+ 	size_t outlen;
+ 
+-	outlen = (mpz_sizeinbase(modulus, 2) + 7) / 8;
++	outlen = (mpz_sizeinbase(rkey->n, 2) + 7) / 8;
+ 	if (outlen > max_mod_len)
+ 		return 1;
+-	outlen = (mpz_sizeinbase(exponent, 2) + 7) / 8;
++	outlen = (mpz_sizeinbase(rkey->e, 2) + 7) / 8;
+ 	if (outlen > max_exp_len)
+ 		return 1;
+