- Plug a memory leak in ng_netflow_cache_init(). - Initialize error to 0 in ng_netflow_flow_add() (a nop change). - Update cache statistics holding workqueue mutex.
- Plug a memory leak in ng_netflow_cache_init().
- Initialize error to 0 in ng_netflow_flow_add() (a nop change).
- Update cache statistics holding workqueue mutex.

MFC after:	3 days

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