[Bug 755201] playback-test: Dont free null array

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755201

--- Comment #1 from RaviKiran <ravi.kiran at samsung.com> ---
Created attachment 311602
  --> https://bugzilla.gnome.org/attachment.cgi?id=311602&action=edit
free array only if not null

Patch attached. Please review.

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