Original commit message from CVS:
* gst/playback/gstdecodebin.c: (gst_decode_bin_factory_filter),
(add_fakesink), (remove_fakesink), (pad_probe), (close_pad_link),
(is_demuxer_element), (try_to_link_1), (get_our_ghost_pad),
(new_pad):
Cleanups and small leak fixes.
Added Depayloaders to valid list of autopluggable elements.