[PATCH v3 10/15] libfdt: overlay: Make fdto const in overlay_apply_node()

[Douglas Anderson <dianders@chromium.org>]

`overlay_apply_node()` only reads from the overlay blob `@fdto` while
merging properties and subnodes into `@fdt`. Mark `@fdto` as
`const void *` so callers holding a `const void *fdto` pointer (such as
the upcoming `/__local_fixups__` update logic) can call
`overlay_apply_node()` without casting away `const`.

Assisted-by: Gemini:gemini-pro-prerelease
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

Changes in v3:
- Split constifying fdto in overlay_apply_node() out of "libfdt:
  overlay: Update base /__local_fixups__ on apply" into a standalone
  patch (David Gibson)

 libfdt/fdt_overlay.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libfdt/fdt_overlay.c b/libfdt/fdt_overlay.c
index 36f2377cf7d8..4b3e17bd087e 100644
--- a/libfdt/fdt_overlay.c
+++ b/libfdt/fdt_overlay.c
@@ -821,7 +821,7 @@ static int overlay_prevent_phandle_overwrite(void *fdt, void *fdto)
  *      Negative error code on failure
  */
 static int overlay_apply_node(void *fdt, int target,
-			      void *fdto, int node)
+			      const void *fdto, int node)
 {
 	int property;
 	int subnode;
-- 
2.56.0.317.g454f8302e1-goog