drivers/net/wireless: fix sparse warnings: make symbols static

Fix this sparse warnings:

drivers/net/wireless/airo.c:3610:6: warning: symbol 'mpi_receive_802_11' was not declared. Should it be static?
drivers/net/wireless/atmel.c:3183:6: warning: symbol 'atmel_join_bss' was not declared. Should it be static?
drivers/net/wireless/ray_cs.c:831:5: warning: symbol 'ray_dev_init' was not declared. Should it be static?

Signed-off-by: Hannes Eder <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/wireless/airo.c

···
 	}
 }
 
-void mpi_receive_802_11 (struct airo_info *ai)
+static void mpi_receive_802_11(struct airo_info *ai)
 {
 	RxFid rxd;
 	struct sk_buff *skb = NULL;

drivers/net/wireless/atmel.c

···
 	}
 }
 
-void atmel_join_bss(struct atmel_private *priv, int bss_index)
+static void atmel_join_bss(struct atmel_private *priv, int bss_index)
 {
 	struct bss_info *bss =  &priv->BSSinfo[bss_index];
 

drivers/net/wireless/ray_cs.c

···
 }
 
 /*===========================================================================*/
-int ray_dev_init(struct net_device *dev)
+static int ray_dev_init(struct net_device *dev)
 {
 #ifdef RAY_IMMEDIATE_INIT
     int i;