[Bug 752359] playback-test: fix memory leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752359

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 307385
  --> https://bugzilla.gnome.org/attachment.cgi?id=307385&action=edit
fix memory leaks

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