ext/ogg/gstoggdemux.c: Also FLUSH upstream, makes the loop function exit faster.

ext/ogg/gstoggdemux.c: Also FLUSH upstream, makes the loop function exit faster.

Original commit message from CVS:
* ext/ogg/gstoggdemux.c: (gst_ogg_demux_activate_chain),
(gst_ogg_demux_perform_seek), (gst_ogg_demux_clear_chains):
Also FLUSH upstream, makes the loop function exit faster.

* ext/theora/theoradec.c: (theora_dec_src_query):
Some more debug info in the query.

* sys/ximage/ximagesink.c: (gst_ximagesink_ximage_new),
(gst_ximagesink_setcaps):
Release lock on par error, better error reporting.