Staging: batman-adv: Rewrite hash using hlist_*

The hash implementation is a complete implementation of a hash using
buckets as hash entries and overflow buckets attached to them.

The kernel already provides datastructures hlist_head and hlist_node
which can be used to implement an hash using lists as hash buckets. So
it is better to implement heavily used functionality on top of those
instead of providing a full hash implementation.

The rewrite changes the behavior of some functions slightly:
 * hash_add add elements to the front instead of the tail
 * hash_iterate doesn't provide pointer to access bucket->data directly,
   but it can be accessed using hlist_entry

Reported-by: David S. Miller <[email protected]>
Signed-off-by: Sven Eckelmann <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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