gst/auparse/gstauparse.c: Don't push buffers into the adapter that we are going to push downstream again without fram...

Original commit message from CVS:
* gst/auparse/gstauparse.c: (gst_au_parse_chain):
Don't push buffers into the adapter that we are going to
push downstream again without framing anyway. Also, the
adaptor takes ownership of buffers put into it (fixes
auparse pushing invalid buffers for .au files with
ADPCM contents). Finally, set caps on all outgoing buffers.