[vdr] Fix Pid not available error in the streamdev plugin VDR-VDR connection

[Jose Alberto Reguero]

This patch fix the error "Pid xxx not available" in the streamdev plugin with 
VDR-VDR connection, that cause not tunning to the channel.
The problem is that sometimes, when cConnectionVTP::CmdADDP is called, 
m_LiveStreamer is NULL, and then return an errorr.
m_LiveStreamer became null in cConnectionVTP::CmdABRT that is called from 
cStreamdevDevice::CloseDvrInt called from cStreamdevDevice::CloseDvr.

Jose Alberto
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