net: genetlink: remove unused genl_family_attrbuf()

genl_family_attrbuf() function is no longer used by anyone, so remove it.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/genetlink.h

@@ -75,8 +75,6 @@ struct genl_family {
 	struct module		*module;
 };
 
-struct nlattr **genl_family_attrbuf(const struct genl_family *family);
-
 /**
  * struct genl_info - receiving information
  * @snd_seq: sending sequence number

net/netlink/genetlink.c

@@ -1164,25 +1164,6 @@ static int __init genl_init(void)
 
 subsys_initcall(genl_init);
 
-/**
- * genl_family_attrbuf - return family's attrbuf
- * @family: the family
- *
- * Return the family's attrbuf, while validating that it's
- * actually valid to access it.
- *
- * You cannot use this function with a family that has parallel_ops
- * and you can only use it within (pre/post) doit/dumpit callbacks.
- */
-struct nlattr **genl_family_attrbuf(const struct genl_family *family)
-{
-	if (!WARN_ON(family->parallel_ops))
-		lockdep_assert_held(&genl_mutex);
-
-	return family->attrbuf;
-}
-EXPORT_SYMBOL(genl_family_attrbuf);
-
 static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group,
 			 gfp_t flags)
 {