[Bug 778279] validate: fix leaks

[GStreamer (GNOME Bugzilla)]

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

--- Comment #3 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 345103
  --> https://bugzilla.gnome.org/attachment.cgi?id=345103&action=edit
validate: fix leak in overrides test

The runner was never released.

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