netpoll: Remove unused inline function netpoll_netdev_init()

commit d565b0a1a9b6 ("net: Add Generic Receive Offload infrastructure")
left behind this, remove it.

Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/netpoll.h

···
 static inline void netpoll_poll_unlock(void *have)
 {
 }
-static inline void netpoll_netdev_init(struct net_device *dev)
-{
-}
 static inline bool netpoll_tx_running(struct net_device *dev)
 {
 	return false;