efi_loader: printf code in efi_disk_get_device_name()

part is unsigned. So it must be printed with %u.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index e6a356b..a209505 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -786,7 +786,8 @@
 	if (is_partition) {
 		part_data = dev_get_uclass_plat(dev);
 		part = part_data->partnum;
-		count = snprintf(buf, size, "%s %d:%d", if_typename, diskid, part);
+		count = snprintf(buf, size, "%s %d:%u", if_typename, diskid,
+				 part);
 	} else {
 		count = snprintf(buf, size, "%s %d", if_typename, diskid);
 	}