[PATCH] dm: make uclass_find_first_device() return error when no defice is found

[Masahiro Yamada]

uclass_find_first_device() succeeds even if it cannot find any device.
So, the caller must check the return code and also *devp is not NULL.

Returning -ENODEV will be sensible in this case.

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---

If this patch is acceptable, I want to fold this
into my pull request because it need it
for my another patch:
http://patchwork.ozlabs.org/patch/1238000/

 drivers/core/uclass.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 58b19a421091..3580974f3b85 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -227,7 +227,7 @@ int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
 	if (ret)
 		return ret;
 	if (list_empty(&uc->dev_head))
-		return 0;
+		return -ENODEV;
 
 	*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
 
-- 
2.17.1