[Bug 751306] good plugins: fix some issues found using static analysis tool

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751306

--- Comment #2 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 305800
  --> https://bugzilla.gnome.org/attachment.cgi?id=305800&action=edit
matroska: remove useless check

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