[][openwrt][mt7988][tops: init skb_hnat_is_decrypt(skb)]

[Description]
Fix bug: initialize skb_hnat_is_decrypt(skb), otherwise tport may be
assigned the wrong value in L2TP/IPSec scenario.

[Release-log]
N/A

Change-Id: If4c65e2c0d23acee0185c4530e97c166abc603a2
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7961378
1 file changed