[PATCH] genhd must_check warning fix

[Roland McGrath]

Fixes:

	block/genhd.c:361: warning: ignoring return value of âclass_registerâ, declared with attribute warn_unused_result

Signed-off-by: Roland McGrath <roland@xxxxxxxxxx>
---
 block/genhd.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index c44527d..00da521 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -360,7 +360,9 @@ static struct kobject *base_probe(dev_t devt, int *part, void *data)
 
 static int __init genhd_device_init(void)
 {
-	class_register(&block_class);
+	int error = class_register(&block_class);
+	if (unlikely(error))
+		return error;
 	bdev_map = kobj_map_init(base_probe, &block_class_lock);
 	blk_dev_init();
 
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