[ATALK] fix compilation of appletalk drivers

The s/at_addr/atalk_addr/ in atalk.h broke the compilation of
drivers/net/appletalk/*. The patch below fixes it. From Adrian Bunk.

drivers/net/appletalk/cops.c

@@ -181,7 +181,7 @@ struct cops_local
         int board;			/* Holds what board type is. */
 	int nodeid;			/* Set to 1 once have nodeid. */
         unsigned char node_acquire;	/* Node ID when acquired. */
-        struct at_addr node_addr;	/* Full node address */
+        struct atalk_addr node_addr;	/* Full node address */
 };
 
 /* Index to functions, as function prototypes. */
@@ -955,8 +955,8 @@ static int cops_hard_header(struct sk_buff *skb, struct net_device *dev,
 static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
         struct cops_local *lp = (struct cops_local *)dev->priv;
-        struct sockaddr_at *sa=(struct sockaddr_at *)&ifr->ifr_addr;
-        struct at_addr *aa=(struct at_addr *)&lp->node_addr;
+        struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr;
+        struct atalk_addr *aa = (struct atalk_addr *)&lp->node_addr;
 
         switch(cmd)
         {

drivers/net/appletalk/ipddp.c

@@ -116,7 +116,7 @@ static int ipddp_xmit(struct sk_buff *skb, struct net_device *dev)
 	u32 paddr = ((struct rtable*)skb->dst)->rt_gateway;
         struct ddpehdr *ddp;
         struct ipddp_route *rt;
-        struct at_addr *our_addr;
+        struct atalk_addr *our_addr;
 
 	/*
          * Find appropriate route to use, based only on IP number.

drivers/net/appletalk/ipddp.h

@@ -15,7 +15,7 @@ struct ipddp_route
 {
         struct net_device *dev;             /* Carrier device */
         __u32 ip;                       /* IP address */
-        struct at_addr at;              /* Gateway appletalk address */
+        struct atalk_addr at;              /* Gateway appletalk address */
         int flags;
         struct ipddp_route *next;
 };

drivers/net/appletalk/ltpc.c

@@ -262,7 +262,7 @@ static unsigned char *ltdmacbuf;
 struct ltpc_private
 {
 	struct net_device_stats stats;
-	struct at_addr my_addr;
+	struct atalk_addr my_addr;
 };
 
 /* transmit queue element struct */
@@ -826,7 +826,7 @@ static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
 	struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
 	/* we'll keep the localtalk node address in dev->pa_addr */
-	struct at_addr *aa = &((struct ltpc_private *)dev->priv)->my_addr;
+	struct atalk_addr *aa = &((struct ltpc_private *)dev->priv)->my_addr;
 	struct lt_init c;
 	int ltflags;