[Bug 768761] wayland: Error check before using cached wl_display

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768761

--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Ah, another comment: I'd be great if you add in the commit description, what
you said in the bug description, explaining why this patch is needed.

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