- remove an extra parenthesis in a closing brace; - add the macro NETMAP_RING_FIRST_RESERVED() which returns   the index of the first non-released buffer in the ring   (this is useful for code that retains buffers for some time   instead of processing them immediately)
- remove an extra parenthesis in a closing brace;
- add the macro NETMAP_RING_FIRST_RESERVED() which returns
  the index of the first non-released buffer in the ring
  (this is useful for code that retains buffers for some time
  instead of processing them immediately)

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