[Bug 787124] vaapih264dec: segmentation fault when decoding kodi sample

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787124

--- Comment #22 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Created attachment 373468
  --> https://bugzilla.gnome.org/attachment.cgi?id=373468&action=edit
vaapidecoder_h264: Avoid use after free

In some cases, the found_picture ended up being evicted and freed, which
would lead to a use after free when accessing picture->base.poc. In this
fix, we take a ref on the picture before calling dpb_evict.

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