Added condition to check if wifi command already exists in rc.local

packages/qmp-small-node/files/etc/uci-defaults/qmp_wifi_restart

@@ -3,6 +3,8 @@
 # Temporal script to re-enable wifi after the boot
 # this is to fix a temporaly issue when you are using non-standard wifi chanels
 
-sed -i -e "/^exit 0/d" /etc/rc.local
-echo "wifi" >> /etc/rc.local
+if [ $(cat /etc/rc.local | grep -c ^wifi) -lt 1 ]; then
+	sed -i -e "/^exit 0/d" /etc/rc.local
+	echo "wifi" >> /etc/rc.local
+fi