util: rzalloc and free hash_table_u64

Otherwise we're prone to leaking the table itself, since it's not freed
in the destroy function

CID: 1516552
fixes: 6649b840c34016b4753e69d4513a8d09da9febb2
       ("mesa/util: add a hash table wrapper which support 64-bit keys")

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21499>
(cherry picked from commit ff494361bee7506db701cb861073ab194ae3a6e9)
2 files changed