[Bug 753021] dashdemux: add a check for seek type in parse_seek function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753021

--- Comment #2 from Jimmy Ohn <yongjin.ohn at lge.com> ---
Dear edward and thiagoss
could you review this patch?

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