[Bug 795109] fakevideosink: should request an extra buffer if enable-last-sample is enabled

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795109

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 370697
  --> https://bugzilla.gnome.org/attachment.cgi?id=370697&action=edit
fakevideosink: request an extra buffer if enable-last-sample is enabled

If the 'enable-last-sample' property is enabled, fakevideosink will keep
a reference on last rendered buffer which may lead to buffer starvation
in the pipeline.
Request one extra buffer in this case so we always have a buffer flying
in the pipeline.

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