fdt_overlay_target_offset
ret = fdt_overlay_target_offset(fdt, fdto, fragment, &target_path);
target = fdt_overlay_target_offset(fdt, fdto, fragment, NULL);
target = fdt_overlay_target_offset(fdt, fdto, fragment, NULL);
ret = fdt_overlay_target_offset(fdt, fdto, fragment, &target_path);
int fdt_overlay_target_offset(const void *fdt, const void *fdto,