gst/qtdemux/qtdemux.c: set explicit caps before adding the element, so the autoplugge...

gst/qtdemux/qtdemux.c: set explicit caps before adding the element, so the autopluggers can plug correctly.

Original commit message from CVS:
2004-02-03  Benjamin Otte  <in7y118@public.uni-hamburg.de>

* gst/qtdemux/qtdemux.c: (gst_qtdemux_add_stream):
set explicit caps before adding the element, so the autopluggers can
plug correctly.
* gst/typefind/gsttypefindfunctions.c: (mp3_type_find),
(mpeg2_sys_type_find), (mpeg1_sys_type_find),
(mpeg_video_type_find), (mpeg_video_stream_type_find),
(dv_type_find):
fix memleaks in typefind functions. gst_type_find_suggest takes a const
argument.