[Bug 727867] New: qtdemux: remove duplicated source code

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=727867
  GStreamer | gst-plugins-good | 1.x

           Summary: qtdemux: remove duplicated source code
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: yongjin.ohn at lge.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I found duplicated source code in qtdemux_parse_trex function.
When we get the default sample size in this function, it's duplicated.
For code efficiency, we should remove it.
The following patch remove duplicated source code in qtdemux.

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