[Bug 753556] matroska: Remove unused variables

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753556

--- Comment #1 from RaviKiran <ravi.kiran at samsung.com> ---
Created attachment 309138
  --> https://bugzilla.gnome.org/attachment.cgi?id=309138&action=edit
remove unused variable

Pls review

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