gst/avi/gstavidemux.c: The index reading was broken. The rest worked fine, but the whole goal of my rewrite was to ma...

Original commit message from CVS:
2004-01-25  Ronald Bultje  <rbultje@ronald.bitfreak.net>

* gst/avi/gstavidemux.c: (gst_avi_demux_stream_avih),
(gst_avi_demux_stream_odml), (gst_avi_demux_stream_index):
The index reading was broken. The rest worked fine, but the whole
goal of my rewrite was to make avidemux readable, and this was
not at all readable. Please use typed variables.