of: overlay: correctly apply overlay node with unit-address

Correct existing node name detection when overlay node name has
a unit-address.

Expected test result is overlay will update the nodes and properties
for /testcase-data-2/fairway-1/ride@100/ after this commit.

Before this commit:

   Console error message near end of unittest:
      OF: Duplicate name in fairway-1, renamed to "ride@100#1"

   $ cd /proc/device-tree/testcase-data-2/fairway-1/
   $ # extra node: ride@100#1
   $ ls
   #address-cells  linux,phandle   phandle         ride@200
   #size-cells     name            ride@100        status
   compatible      orientation     ride@100#1
   $ cd /proc/device-tree/testcase-data-2/fairway-1/ride@100/
   $ ls track@30/incline-up
   ls: track@30/incline-up: No such file or directory
   $ ls track@40/incline-up
   ls: track@40/incline-up: No such file or directory

After this commit:

   Console error message no longer occurs

   $ cd /proc/device-tree/testcase-data-2/fairway-1/
   $ # no extra node: ride@100#1
   $ ls
   #address-cells  compatible      name            phandle         ride@200
   #size-cells     linux,phandle   orientation     ride@100        status
   $ cd /proc/device-tree/testcase-data-2/fairway-1/ride@100/
   $ ls track@30/incline-up
   track@30/incline-up
   $ ls track@40/incline-up
   track@40/incline-up
Signed-off-by: NFrank Rowand <frank.rowand@sony.com>
Signed-off-by: NRob Herring <robh@kernel.org>

drivers/of/overlay.c

@@ -130,7 +130,10 @@ static int of_overlay_apply_single_device_node(struct of_overlay *ov,
 		return -ENOMEM;
 
 	/* NOTE: Multiple mods of created nodes not supported */
-	tchild = of_get_child_by_name(target, cname);
+	for_each_child_of_node(target, tchild)
+		if (!of_node_cmp(cname, kbasename(tchild->full_name)))
+			break;
+
 	if (tchild != NULL) {
 		/* new overlay phandle value conflicts with existing value */
 		if (child->phandle)