Update for alloc_buffer changes.

Update for alloc_buffer changes.

Original commit message from CVS:
2005-12-05  Andy Wingo  <wingo@pobox.com>

* ext/faac/gstfaac.c: (gst_faac_sink_event), (gst_faac_chain):
* ext/faad/gstfaad.c: (gst_faad_chain):
* ext/hermes/gsthermescolorspace.c: (gst_hermes_colorspace_chain):
* ext/lcs/gstcolorspace.c: (gst_colorspace_chain):
* ext/xine/xineinput.c: (gst_xine_input_get):
* gst/colorspace/gstcolorspace.c: (gst_colorspace_chain):
* gst/speed/gstspeed.c: (speed_chain):
* gst/videocrop/gstvideocrop.c: (gst_video_crop_chain): Update for
alloc_buffer changes.