fix xlnetacc logout (#4422)

package/lean/luci-app-xlnetacc/root/etc/init.d/xlnetacc

@@ -32,10 +32,10 @@ stop() {
 	local pid spid
 	for pid in $(ps | grep xlnetacc.sh | grep -v 'grep' | awk '{print $1}'); do
 		echo "Stop XLNetAcc process PID: $pid"
-		kill -9 $pid >/dev/null 2>&1
+		kill $pid >/dev/null 2>&1
 		for spid in $(pgrep -P $pid "sleep"); do
 			echo "Stop XLNetAcc process SPID: $spid"
-			kill -9 $spid >/dev/null 2>&1
+			kill $spid >/dev/null 2>&1
 		done
 	done
 	logger -p "daemon.notice" -t "$NAME" "XLNetAcc has stoped."