bootstd: Fix listing boot devices

bootdev_list() uses uclass_*_device_err() to iterate devices.
However, the only value _err adds is returning an error when the device
pointer is null, and that's checked anyway.

Also there is some intent to report errors, and that's what
uclass_*_device_check() is for, use it.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/bootdev-uclass.c b/boot/bootdev-uclass.c
index 13ac69e..9d98bee 100644
--- a/boot/bootdev-uclass.c
+++ b/boot/bootdev-uclass.c
@@ -195,7 +195,7 @@
 	printf("Seq  Probed  Status  Uclass    Name\n");
 	printf("---  ------  ------  --------  ------------------\n");
 	if (probe)
-		ret = uclass_first_device_err(UCLASS_BOOTDEV, &dev);
+		ret = uclass_first_device_check(UCLASS_BOOTDEV, &dev);
 	else
 		ret = uclass_find_first_device(UCLASS_BOOTDEV, &dev);
 	for (i = 0; dev; i++) {
@@ -204,7 +204,7 @@
 		       ret ? simple_itoa(ret) : "OK",
 		       dev_get_uclass_name(dev_get_parent(dev)), dev->name);
 		if (probe)
-			ret = uclass_next_device_err(&dev);
+			ret = uclass_next_device_check(&dev);
 		else
 			ret = uclass_find_next_device(&dev);
 	}