[Bug 755123] tagdemux: protect internal state for concurrent access

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755123

--- Comment #12 from GstBlub <gstblub at gmail.com> ---
I omitted the assertion warning:

** (xxxxxxxxx:24472): CRITICAL **:
gst_pb_utils_add_codec_description_to_tag_list: assertion 'caps != NULL' failed

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