[Bug 788058] Use GObject properties in GstVaapiDisplay

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788058

--- Comment #5 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 360282
  --> https://bugzilla.gnome.org/attachment.cgi?id=360282&action=edit
libs: display: initialize value if they are not yet

This is a difference between the GObject API and the GstVaapi one: the
GValue passed to get a property value, in GObject has to be
initialized with g_value_init(), but in GstVaapi is has not.

In order to overcome this mismatch, this patch call g_value_init()
internally only in the passed one is not already initialized.

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