ipv6: Create cleanup helper for fib6_nh

Move the fib6_nh cleanup code to a new helper, fib6_nh_release.
Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip6_fib.h

@@ -447,6 +447,7 @@ static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
 int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
 		 struct fib6_config *cfg, gfp_t gfp_flags,
 		 struct netlink_ext_ack *extack);
+void fib6_nh_release(struct fib6_nh *fib6_nh);
 
 static inline
 struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)

net/ipv6/ip6_fib.c

@@ -199,10 +199,7 @@ void fib6_info_destroy_rcu(struct rcu_head *head)
 		free_percpu(f6i->rt6i_pcpu);
 	}
 
-	lwtstate_put(f6i->fib6_nh.nh_lwtstate);
-
-	if (f6i->fib6_nh.nh_dev)
-		dev_put(f6i->fib6_nh.nh_dev);
+	fib6_nh_release(&f6i->fib6_nh);
 
 	ip_fib_metrics_put(f6i->fib6_metrics);
 

net/ipv6/route.c

@@ -3025,6 +3025,14 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
 	return err;
 }
 
+void fib6_nh_release(struct fib6_nh *fib6_nh)
+{
+	lwtstate_put(fib6_nh->nh_lwtstate);
+
+	if (fib6_nh->nh_dev)
+		dev_put(fib6_nh->nh_dev);
+}
+
 static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
 					      gfp_t gfp_flags,
 					      struct netlink_ext_ack *extack)