[-mm Patch]nbd: check the return value of sysfs_create_file

[WANG Cong]

Since 'sysfs_create_file' is declared with attribute warn_unused_result, we must always check its return value carefully.

Signed-off-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>

---

--- linux-2.6.21-rc7-mm2/drivers/block/nbd.c.orig	2007-04-27 17:27:47.000000000 +0800
+++ linux-2.6.21-rc7-mm2/drivers/block/nbd.c	2007-04-27 17:47:32.000000000 +0800
@@ -373,7 +373,10 @@ static void nbd_do_it(struct nbd_device 
 	BUG_ON(lo->magic != LO_MAGIC);
 
 	lo->pid = current->pid;
-	sysfs_create_file(&lo->disk->kobj, &pid_attr.attr);
+	if (sysfs_create_file(&lo->disk->kobj, &pid_attr.attr)) {
+		printk(KERN_ERR "nbd: sysfs_create_file failed!");
+		return;
+	}
 
 	while ((req = nbd_read_stat(lo)) != NULL)
 		nbd_end_request(req);
-
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