[Bug 795145] appsink: Reuse sample object in pull_sample if possible

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795145

--- Comment #1 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 370760
  --> https://bugzilla.gnome.org/attachment.cgi?id=370760&action=edit
appsink: Reuse sample object in pull_sample if possible

Simple optimization to reduce memory allocations.

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