[Bug 754013] validate: Print the return value at the end

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754013

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 309906
  --> https://bugzilla.gnome.org/attachment.cgi?id=309906&action=edit
print return value at the end

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