gst/: Return FLOW_UNEXPECTED when at the end of the file, not

gst/: Return FLOW_UNEXPECTED when at the end of the file, not

Original commit message from CVS:
* gst/apetag/gsttagdemux.c: (gst_tag_demux_chain):
* gst/id3demux/gstid3demux.c: (gst_id3demux_chain):
Return FLOW_UNEXPECTED when at the end of the file, not
FLOW_ERROR. Fixes 'internal stream error' errors that
would sometimes occur in totem when scrubbing to the
end of an ID3v1 tagged mp3 file.