KeepLive PingReq Packet send wrong

[sunkuo]

In the time_mosq.c file ,line 88 , You should change "sec = (ticks/1000000000)(tb.numer/tb.denom);" to "sec = (ticks(tb.numer/tb.denom)/1000000000);"
Otherwise , when you set keepLive to 5 second ,MQTTKit keep reconnected to server