OSV-2026-970 Use-of-uninitialized-value in ogs_cpystrn

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=527978938 Crash type: Use-of-uninitialized-value Crash state: ogscpystrn ogsnas5gsdecodednn ogsnas5gsdecodepdusessionestablishmentaccept...