[Bug 763968] New: qtdemux: Add check condition for fail case in get_duration function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763968

            Bug ID: 763968
           Summary: qtdemux: Add check condition for fail case in
                    get_duration function
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: yongjin.ohn at lge.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently, get_duration function always return the TRUE value even though it
can't be set the duration correctly. So, we need to add the else condition
about the fail case.
So I have modify it and related caller function.

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