batman-adv: Move definition of atomic_dec_not_zero() into main.h

atomic_dec_not_zero() is very useful and it is currently defined
multiple times. So it is possible to move it in main.h
Signed-off-by: NAntonio Quartulli <ordex@autistici.org>
Signed-off-by: NSven Eckelmann <sven@narfation.org>

net/batman-adv/aggregation.c

@@ -95,7 +95,6 @@ static bool can_aggregate_with(struct batman_packet *new_batman_packet,
 	return false;
 }
 
-#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
 /* create a new aggregated packet and add this packet to it */
 static void new_aggregated_packet(unsigned char *packet_buff, int packet_len,
 				  unsigned long send_time, bool direct_link,

net/batman-adv/main.h

@@ -175,4 +175,6 @@ static inline int compare_eth(void *data1, void *data2)
 	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
 }
 
+#define atomic_dec_not_zero(v)	atomic_add_unless((v), -1, 0)
+
 #endif /* _NET_BATMAN_ADV_MAIN_H_ */

net/batman-adv/send.c

@@ -393,7 +393,6 @@ static void _add_bcast_packet_to_list(struct bat_priv *bat_priv,
 			   send_time);
 }
 
-#define atomic_dec_not_zero(v)          atomic_add_unless((v), -1, 0)
 /* add a broadcast packet to the queue and setup timers. broadcast packets
  * are sent multiple times to increase probability for beeing received.
  *