[][Fix symbol err]

[Description]
Fix symbol err

[Release-log]
N/A

Change-Id: I353ad04cf0e508398585f35181ea36c2d13e7458
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6213660
diff --git a/target/linux/mediatek/base-files/sbin/smp-mt76.sh b/target/linux/mediatek/base-files/sbin/smp-mt76.sh
index c469c5c..c01743c 100755
--- a/target/linux/mediatek/base-files/sbin/smp-mt76.sh
+++ b/target/linux/mediatek/base-files/sbin/smp-mt76.sh
@@ -99,11 +99,15 @@
 	if [[ "$WED_ENABLE" -eq "1" ]]; then
 		dbg2 "WED_ENABLE ON irq/iptable setting"
 		#TCP Binding
-		iptables -I FORWARD 1 -p tcp -m conntrack --ctstate RELATED,ESTABLISHED -j FLOWOFFLOAD --hw
-		ip6tables -I FORWARD 1 -p tcp -m conntrack --ctstate RELATED,ESTABLISHED -j FLOWOFFLOAD --hw
+		iptables -D FORWARD -p tcp -m conntrack --ctstate RELATED,ESTABLISHED -j FLOWOFFLOAD --hw
+		iptables -I FORWARD -p tcp -m conntrack --ctstate RELATED,ESTABLISHED -j FLOWOFFLOAD --hw
+		ip6tables -D FORWARD -p tcp -m conntrack --ctstate RELATED,ESTABLISHED -j FLOWOFFLOAD --hw
+		ip6tables -I FORWARD -p tcp -m conntrack --ctstate RELATED,ESTABLISHED -j FLOWOFFLOAD --hw
 		#UDP Binding
-		iptables -I FORWARD 1 -p udp -j FLOWOFFLOAD --hw
-		ip6tables -I FORWARD 1 -p udp -j FLOWOFFLOAD --hw
+		iptables -D FORWARD -p udp -j FLOWOFFLOAD --hw
+		iptables -I FORWARD -p udp -j FLOWOFFLOAD --hw
+		ip6tables -D FORWARD -p udp -j FLOWOFFLOAD --hw
+		ip6tables -I FORWARD -p udp -j FLOWOFFLOAD --hw
 
 		#AX6000 AX7800 - SOC
 		if [[ "$WIFI_RADIO1" -eq "1" ]]; then