From: Leonardo Potenza <lpotenza@inwind.it>

Added a check for the class_register() return value.

Signed-off-by: Leonardo Potenza <lpotenza@inwind.it>
---

The aim of this patch is to remove the following warning message:
block/genhd.c: In function 'genhd_device_init':
block/genhd.c:361: warning: ignoring return value of 'class_register', declared with attribute warn_unused_result

--- linux-2.6.orig/block/genhd.c
+++ linux-2.6/block/genhd.c
@@ -358,7 +358,12 @@ static struct kobject *base_probe(dev_t 
 
 static int __init genhd_device_init(void)
 {
-	class_register(&block_class);
+	int ret;
+
+	ret = class_register(&block_class);
+	if (ret != 0)
+		return ret;
+
 	bdev_map = kobj_map_init(base_probe, &block_class_lock);
 	blk_dev_init();
 
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