Original commit message from CVS:
* ext/ffmpeg/gstffmpegdec.c: (gst_ffmpegdec_base_init):
* ext/ffmpeg/gstffmpegenc.c: (gst_ffmpegenc_base_init):
Fix category.
* ext/ffmpeg/gstffmpegdemux.c: (gst_ffmpegdemux_class_init),
(gst_ffmpegdemux_init), (gst_ffmpegdemux_close):
Slightly rewrite the init function, old one was ugly. Also remove
dispose function since it's obsolete, the change_state function
cleans up already. Also fixes segfault in test-app
gstreamer/tests/instantiate/create