fix: a memory leak (QOS > 0)

Signed-off-by: dawxy <97687341@qq.com>

Author: dawxy

net.go

@@ -267,6 +267,7 @@ func alllogic(c *client) {
 					pa := packets.NewControlPacket(packets.Puback).(*packets.PubackPacket)
 					pa.MessageID = m.MessageID
 					DEBUG.Println(NET, "putting puback msg on obound")
+					persistOutbound(c.persist, pa)
 					select {
 					case c.oboundP <- &PacketAndToken{p: pa, t: nil}:
 					case <-c.stop:
@@ -297,6 +298,7 @@ func alllogic(c *client) {
 				DEBUG.Println(NET, "received pubrel, id:", m.MessageID)
 				pc := packets.NewControlPacket(packets.Pubcomp).(*packets.PubcompPacket)
 				pc.MessageID = m.MessageID
+				persistOutbound(c.persist, pc)
 				select {
 				case c.oboundP <- &PacketAndToken{p: pc, t: nil}:
 				case <-c.stop: