[Bug 766645] New: matroskademux: Remove unnecessary lock condition

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766645

            Bug ID: 766645
           Summary: matroskademux: Remove unnecessary lock condition
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: sh.yang at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

matroskademux: Remove unnecessary lock condition

matroska-demux has GST_OBJECT_LOCK in
- gst_matroska_demux_push_codec_data_all()
- gst_matroska_demux_query()

Some parse element such as FLAC checks upstream seekability, and
there is some use cases that matroska-demux is linked to a parse element
(e.g.,FLAC format) without intermediate elements (e.g., queue).
In this case, matroska-demux never get return of
gst_matroska_demux_push_codec_data_all(), because the parse element
can return it after the parse element receives return of upstream query.

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