fdt: fix dev_get_addr_name node offset

Use the device's own DT offset, not the device's parent's.

Fixes: 43c4d44e3330 ("fdt: implement dev_get_addr_name()")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/device.c b/drivers/core/device.c
index 1322991..2b12ce7 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -657,8 +657,8 @@
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 	int index;
 
-	index = fdt_find_string(gd->fdt_blob, dev->parent->of_offset,
-				"reg-names", name);
+	index = fdt_find_string(gd->fdt_blob, dev->of_offset, "reg-names",
+				name);
 	if (index < 0)
 		return index;