[Bug 763799] alsasrc: should not always assume that 8 channels implies 7.1 setup

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763799

--- Comment #3 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 324450
  --> https://bugzilla.gnome.org/attachment.cgi?id=324450&action=edit
audioringbuffer: don't attempt to reorder position-less channels

As said in its doc GST_AUDIO_CHANNEL_POSITION_NONE is meant to be used
for "position-less channels, e.g. from a sound card that records 1024
channels; mutually exclusive with any other channel position".

But at the moment using such positions would raise a
'g_return_if_reached' warning as gst_audio_get_channel_reorder_map()
would reject it.

Fix this by preventing any attempt to reorder in such case as that's not
what we want anyway.

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