ext/ogg/gstoggdemux.c: The chain should be freed if we error out here, else it will...

ext/ogg/gstoggdemux.c: The chain should be freed if we error out here, else it will leak.

Original commit message from CVS:
* ext/ogg/gstoggdemux.c: (gst_ogg_demux_find_chains):
The chain should be freed if we error out here, else it will leak.
* gst/playback/gstdecodebin.c: (disconnect_unlinked_signals),
(cleanup_decodebin):
Don't forget to *properly* remove the signals, else it will leak.