[Bug 748529] adaptivedemux: only update stream position if query sucess

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748529

--- Comment #1 from Jimmy Ohn <yongjin.ohn at lge.com> ---
Created attachment 302454
  --> https://bugzilla.gnome.org/attachment.cgi?id=302454&action=edit
adaptivedemux: only update stream position if query sucess

We don't need to check if duration query is fail.

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