geneve: Unregister pernet subsys on module unload.
The pernet ops aren't ever unregistered, which causes a memory leak and an OOPs if the module is ever reinserted. Fixes: 0b5e8b8e ("net: Add Geneve tunneling protocol driver") CC: Andy Zhou <azhou@nicira.com> Signed-off-by: NJesse Gross <jesse@nicira.com> Acked-by: NNicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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