Massive leak fixing, plus code cleanups.

Massive leak fixing, plus code cleanups.

Original commit message from CVS:
* ext/audioresample/gstaudioresample.c:
* ext/x264/gstx264enc.c:
* gst/dvdspu/gstdvdspu.c:
* gst/dvdspu/gstdvdspu.h:
* gst/festival/gstfestival.c:
* gst/h264parse/gsth264parse.c:
* gst/mpegtsparse/mpegtspacketizer.c:
* gst/mpegtsparse/mpegtsparse.c:
* gst/multifile/gstmultifilesink.c:
* gst/multifile/gstmultifilesrc.c:
* gst/nuvdemux/gstnuvdemux.c:
* sys/dshowsrcwrapper/gstdshowaudiosrc.c:
* sys/dshowsrcwrapper/gstdshowvideosrc.c:
* sys/vcd/vcdsrc.c:
Massive leak fixing, plus code cleanups.