fs/fscache/object-list.c: use __seq_open_private()

Reduce boilerplate code by using __seq_open_private() instead of seq_open()
in fscache_objlist_open().
Signed-off-by: NRob Jones <rob.jones@codethink.co.uk>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NSteve Dickson <steved@redhat.com>

fs/fscache/object-list.c

@@ -380,26 +380,14 @@ static void fscache_objlist_config(struct fscache_objlist_data *data)
 static int fscache_objlist_open(struct inode *inode, struct file *file)
 {
 	struct fscache_objlist_data *data;
-	struct seq_file *m;
-	int ret;
 
-	ret = seq_open(file, &fscache_objlist_ops);
-	if (ret < 0)
-		return ret;
-
-	m = file->private_data;
-
-	/* buffer for key extraction */
-	data = kmalloc(sizeof(struct fscache_objlist_data), GFP_KERNEL);
-	if (!data) {
-		seq_release(inode, file);
+	data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data));
+	if (!data)
 		return -ENOMEM;
-	}
 
 	/* get the configuration key */
 	fscache_objlist_config(data);
 
-	m->private = data;
 	return 0;
 }