Fix sparse warning:
drivers/net/netdevsim/bus.c:253:5: warning:
 symbol 'nsim_num_vf' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
        return 0;
 }
 
-int nsim_num_vf(struct device *dev)
+static int nsim_num_vf(struct device *dev)
 {
        struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);