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)