[Bug 783000] tests: videoscale: Fix build warning error

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783000

--- Comment #1 from Seungha Yang <sh.yang at lge.com> ---
Created attachment 352428
  --> https://bugzilla.gnome.org/attachment.cgi?id=352428&action=edit
tests: videoscale: Fix build warning error

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