ext/ffmpeg/gstffmpegdec.c: Re-re-enable get_/release_buffer functions, removes a...

ext/ffmpeg/gstffmpegdec.c: Re-re-enable get_/release_buffer functions, removes a few more percent of our CPU usage (#...

Original commit message from CVS:
Reviewed by:  Ronald S. Bultje  <rbultje@ronald.bitfreak.net>
* ext/ffmpeg/gstffmpegdec.c: (gst_ffmpegdec_init),
(gst_ffmpegdec_open), (gst_ffmpegdec_connect),
(gst_ffmpegdec_get_buffer), (gst_ffmpegdec_release_buffer),
(gst_ffmpegdec_frame), (gst_ffmpegdec_change_state):
Re-re-enable get_/release_buffer functions, removes a few more
percent of our CPU usage (#301783).