use-of-uninitialized-value in k5 hashtab add

use-of-uninitialized-value in k5 hashtab add: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function k5 hashtab add in file krb5/src/util/support/hashtab.c