CLSA-2023-1695835334 Fix CVE(s): CVE-2020-22218

SECURITY UPDATE: An issue was discovered in function libssh2packetadd in libssh2 1.10.0 allows attackers to access out of bounds memory. - debian/patches/CVE-2020-22218.patch: doing totalnum zero length check. - CVE-2020-22218...