[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 #3 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Done discovering file:///home/vivia/delme.wav

Topology:
  audio: audio/x-wav
0:00:00.944417687 25062 0x5555557c5b80 ERROR         audio-channels
audio-channels.c:390:gst_audio_channel_positions_from_mask: no channel-mask
property given

Thread 1 "gst-discoverer-" received signal SIGSEGV, Segmentation fault.
0x0000555555557a3c in format_channel_mask (ainfo=0x5555559e4260
[GstDiscovererAudioInfo]) at gst-discoverer.c:169
169         my_g_string_append_printf (s, 0, "%s%s", value->value_nick,
(gdb) print s
$1 = (GString *) 0x5555557c3b20
(gdb) print value
$2 = (GEnumValue *) 0x0
(gdb)

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