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
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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