util/hash_table: introduce a freed key
Reusing the same mechanism as the deleted_key, this adds a free key so that users can hash 0 values.
Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com
Reusing the same mechanism as the deleted_key, this adds a free key so that users can hash 0 values.
Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com