[Bug 778279] validate: fix leaks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778279

--- Comment #4 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 345104
  --> https://bugzilla.gnome.org/attachment.cgi?id=345104&action=edit
valdate: fix element leak in overide-registry

The elements were never released once created.

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