netpoll: Set npinfo to NULL even with ndo_netpoll_cleanup

Since we have to NULL npinfo regardless of whether there is a
ndo_netpoll_cleanup, it makes sense to do this unconditionally
in netpoll_cleanup rather than having every driver do it by
themselves.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/netpoll.c

@@ -867,8 +867,7 @@ void netpoll_cleanup(struct netpoll *np)
 				ops = np->dev->netdev_ops;
 				if (ops->ndo_netpoll_cleanup)
 					ops->ndo_netpoll_cleanup(np->dev);
-				else
-					np->dev->npinfo = NULL;
+				np->dev->npinfo = NULL;
 			}
 		}