Staging: batman-adv: Add hash recommendations to TODO

David Miller <davem@davemloft.net> recommended in
20100924.134334.28812338.davem@davemloft.net that we must make the hash
abstraction helper more efficient and may remove it completely.
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/TODO

+ * remove own list functionality from hash
+ * use hlist_head, hlist_node in hash
+ * don't use callbacks for compare+choose in hash
+ * think about more efficient ways instead of abstraction of hash
  * Request a new review
  * Process the comments from the review
  * Move into mainline proper