stop using sk_protinfo

diff -Nru a/include/linux/atalk.h b/include/linux/atalk.h
@@ -63,6 +63,8 @@
 };
 	
 struct atalk_sock {
+	/* struct sock has to be the first member of atalk_sock */
+	struct sock	sk;
 	unsigned short	dest_net;
 	unsigned short	src_net;
 	unsigned char	dest_node;

@@ -71,6 +73,11 @@
 	unsigned char	src_port;
 };
 
+static inline struct atalk_sock *at_sk(struct sock *sk)
+{
+	return (struct atalk_sock *)sk;
+}
+
 #ifdef __KERNEL__
 
 #include <asm/byteorder.h>

@@ -196,8 +203,6 @@
 					   struct atalk_addr *sa);
 
 extern void		aarp_cleanup_module(void);
-
-#define at_sk(__sk) ((struct atalk_sock *)(__sk)->sk_protinfo)
 
 extern struct hlist_head atalk_sockets;
 extern rwlock_t atalk_sockets_lock;

diff -Nru a/net/appletalk/ddp.c b/net/appletalk/ddp.c
@@ -1022,7 +1022,6 @@
 static int atalk_create(struct socket *sock, int protocol)
 {
 	struct sock *sk;
-	struct atalk_sock *at;
 	int rc = -ESOCKTNOSUPPORT;
 
 	/*

@@ -1032,13 +1031,10 @@
 	if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
 		goto out;
 	rc = -ENOMEM;
-	sk = sk_alloc(PF_APPLETALK, GFP_KERNEL, 1, NULL);
+	sk = sk_alloc(PF_APPLETALK, GFP_KERNEL,
+		      sizeof(struct atalk_sock), NULL);
 	if (!sk)
 		goto out;
-	at = sk->sk_protinfo = kmalloc(sizeof(*at), GFP_KERNEL);
-	if (!at)
-		goto outsk;
-	memset(at, 0, sizeof(*at));
 	rc = 0;
 	sock->ops = &atalk_dgram_ops;
 	sock_init_data(sock, sk);

@@ -1048,9 +1044,6 @@
 	sk->sk_zapped = 1;
 out:
 	return rc;
-outsk:
-	sk_free(sk);
-	goto out;
 }
 
 /* Free a socket. No work needed */