Merges revision [16426] from trunk:

clear _pids_audio on Reset, fix channel change problem.

The PMT of the new channel has probably the same PID as an audio stream
of the previous channel. fixes #4796

Patch by: <laasa gmx de>

git-svn-id: http://svn.mythtv.org/svn/branches/release-0-21-fixes@16427 7dbf422c-18fa-0310-86e9-fd20926502f2

mythtv/libs/libmythtv/mpeg/mpegstreamdata.cpp

@@ -185,6 +185,7 @@ void MPEGStreamData::Reset(int desiredProgram)
     _pids_listening.clear();
     _pids_notlistening.clear();
     _pids_writing.clear();
+    _pids_audio.clear();
 
     _pid_video_single_program = _pid_pmt_single_program = 0xffffffff;