[Bug 796578] discoverer: Don't crash when running with -v if channel-mask==0 and >7 channels

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796578

--- Comment #1 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 372668
  --> https://bugzilla.gnome.org/attachment.cgi?id=372668&action=edit
discoverer: Don't crash when running with -v if channel-mask==0 and >7 channels

For e.g. 16-channel audio, if the channel mask is 0 (which it usually
is), gst_audio_channel_positions_from_mask would get confused,
ultimately leading into a crash.

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