[vdr] channel switch audio pid issue

[Zierath Bernd <B.Zierath@ebv.com>]

Hi,

there seems to be a litle glitch in dvbapi.c , if  you have a channel with
audio pid > 0 and you switch to another  channel  witch have audio pid=0 and
it is on the same transponder you hear the audio from previous channel. I
found this with german cable (channel Leitseite).

Regards
Bernd Zierath