fix issue, parse wrong header length
fix issue, parse wrong header length

https://code.google.com/p/upnpx/issues/detail?id=11

shabbirh/upnpx,plashchynski/upnpx,carhero/upnpx_ios,carhero/upnpx_ios,shabbirh/upnpx,carhero/upnpx,carhero/upnpx_ios,carhero/upnpx,plashchynski/upnpx,shabbirh/upnpx,plashchynski/upnpx,carhero/upnpx