[][Fix duplicate vlan tag in mtk_sw_nat_hook_tx]

[Description]
Fix duplicate vlan tag in mtk_sw_nat_hook_tx.

When pkts forward to wifi, HNAT info about VLAN will be filled in skb_to_hnat_info and mtk_sw_nat_hook_tx respectively.
This will cause the pkts to be added with two layers of VLAN and cannot be forwarded.

[Release-log]
N/A

Change-Id: I1b580a5ba1acce4b353c081e01c52ab18fc3dd39
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5728854
1 file changed