[openwrt/openwrt] ramips: fix image recipe for ASUS RT-N56U

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/708b77f549e852d5156acde03cc76942da29494a

commit 708b77f549e852d5156acde03cc76942da29494a
Author: Shiji Yang <yangshiji66 at qq.com>
AuthorDate: Sat Jul 6 18:27:19 2024 +0800

    ramips: fix image recipe for ASUS RT-N56U
    
    The OpenWrt image metadata includes checksum validation. Therefore,
    it must be generated at the end.
    
    Fixes: https://github.com/openwrt/openwrt/issues/9045
    Fixes: https://github.com/openwrt/openwrt/issues/13674
    Link: https://patchwork.ozlabs.org/project/openwrt/patch/TYCP286MB08952FAACDFA234C5E052131BCD82@TYCP286MB0895.JPNP286.PROD.OUTLOOK.COM/
    Signed-off-by: Shiji Yang <yangshiji66 at qq.com>
---
 target/linux/ramips/image/rt3883.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/linux/ramips/image/rt3883.mk b/target/linux/ramips/image/rt3883.mk
index 0430099296..1728f84444 100644
--- a/target/linux/ramips/image/rt3883.mk
+++ b/target/linux/ramips/image/rt3883.mk
@@ -8,7 +8,8 @@ endef
 define Device/asus_rt-n56u
   SOC := rt3662
   IMAGE_SIZE := 7872k
-  IMAGE/sysupgrade.bin += | mkrtn56uimg -s
+  IMAGE/sysupgrade.bin := $$(sysupgrade_bin) | check-size | \
+	mkrtn56uimg -s | append-metadata
   DEVICE_VENDOR := ASUS
   DEVICE_MODEL := RT-N56U
   DEVICE_PACKAGES := kmod-usb-ohci kmod-usb2