batman-adv: use the const qualifier in hash functions

The data argument in each hash function should carry the
"const" qualifier as it is never modified.
Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

net/batman-adv/bridge_loop_avoidance.c

@@ -57,7 +57,7 @@ static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
 static inline uint32_t batadv_choose_backbone_gw(const void *data,
 						 uint32_t size)
 {
-	struct batadv_claim *claim = (struct batadv_claim *)data;
+	const struct batadv_claim *claim = (struct batadv_claim *)data;
 	uint32_t hash = 0;
 
 	hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));

net/batman-adv/hash.h

@@ -89,7 +89,7 @@ static inline void batadv_hash_delete(struct batadv_hashtable *hash,
  *
  *	Returns the new hash value.
  */
-static inline uint32_t batadv_hash_bytes(uint32_t hash, void *data,
+static inline uint32_t batadv_hash_bytes(uint32_t hash, const void *data,
 					 uint32_t size)
 {
 	const unsigned char *key = data;