net: remove empty inet_exit_net
Pointer members of an object with static storage duration, if not explicitly initialized, will be initialized to a NULL pointer. The net namespace API checks if this pointer is not NULL before using it, it are safe to remove the function. Signed-off-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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