net/ipv6: Remove gc_link warn on in fib6_info_release

A revert of
   3dec89b ("net/ipv6: Remove expired routes with a separated list of routes")
was sent for net-next. Revert the remainder of 5a08d00
which added a warn on if a fib entry is still on the gc_link list
to avoid compile failures when net is merged to net-next

Signed-off-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20231219030742.25715-1-dsahern@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: dsahern

include/net/ip6_fib.h

@@ -328,10 +328,8 @@ static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
 
 static inline void fib6_info_release(struct fib6_info *f6i)
 {
-	if (f6i && refcount_dec_and_test(&f6i->fib6_ref)) {
-		DEBUG_NET_WARN_ON_ONCE(!hlist_unhashed(&f6i->gc_link));
+	if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
 		call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
-	}
 }
 
 enum fib6_walk_state {