Fixes following warning:
drivers/net/vxlan.c:406:6: warning: symbol 'vxlan_fdb_free' was not declared. Should it be static?
drivers/net/vxlan.c:1111:37: warning: Using plain integer as NULL pointer
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
        return 0;
 }
 
-void vxlan_fdb_free(struct rcu_head *head)
+static void vxlan_fdb_free(struct rcu_head *head)
 {
        struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 
                group.remote_vni = vxlan->vni;
                group.remote_ip = vxlan->gaddr;
                group.remote_ifindex = vxlan->link;
-               group.remote_next = 0;
+               group.remote_next = NULL;
                rdst0 = &group;
 
                if (group.remote_ip == htonl(INADDR_ANY) &&