[][Fix variable undefined error]

[Description]
Fix variable undefined error

[Release-log]
N/A

Change-Id: I2a302c485cc11687791865f66ec16373be287b32
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4739981
diff --git a/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c b/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c
index 8f395f8..e4e5fb7 100644
--- a/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c
+++ b/target/linux/mediatek/files-5.4/drivers/net/ethernet/mediatek/mtk_hnat/hnat_debugfs.c
@@ -1962,6 +1962,7 @@
 
 int is_entry_binding(int ppe_id, int index)
 {
+	struct mtk_hnat *h = hnat_priv;
 	struct foe_entry *entry;
 
 	if (ppe_id >= CFG_PPE_NUM)