[Bug 727878] qtdemux: remove duplicated code when parsing trex atom

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=727878
  GStreamer | gst-plugins-good | 1.x

--- Comment #4 from Jimmy <yongjin.ohn at lge.com> 2014-04-09 08:18:24 UTC ---
Created an attachment (id=273866)
 View: https://bugzilla.gnome.org/attachment.cgi?id=273866
 Review: https://bugzilla.gnome.org/review?bug=727878&attachment=273866

remove duplicagted code and add variable

How about to change following patch?
I think that it's better for code readability

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