[Bug 750609] New: validate:media-descriptor-writer: cleanup get tag code

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750609

            Bug ID: 750609
           Summary: validate:media-descriptor-writer: cleanup get tag code
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: gst-devtools
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: chul0812 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I clean up tiny code.
The media-descriptor-writer has called gst_discoverer_info_get_tags twice, so I
just change it to call it once.

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