[Bug 793483] gl/wayland: Memory leak when display couldn't connect

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793483

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 368369
  --> https://bugzilla.gnome.org/attachment.cgi?id=368369&action=edit
gl/wayland: Memory leak when display couldn't connect

When trying to create a wayland display, it may fail because there
is not actually display to connect. It this case NULL is returned
but the created instance is not freed.

This patch unrefs the failed display.

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