OSV-2025-52 Use-of-uninitialized-value in icalmemory_strdup

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=390646669 Crash type: Use-of-uninitialized-value Crash state: icalmemorystrdup icaltimezoneinitbuiltintimezones icaltimezonegetutctimezone...