gst/qtdemux/qtdemux.c: use the correct variable to check if we can calculate the last chunk.  Looks like an obvious b...

Original commit message from CVS:

* gst/qtdemux/qtdemux.c: (gst_qtdemux_loop_header),
(qtdemux_parse_trak):
use the correct variable to check if we can calculate
the last chunk.  Looks like an obvious bug, and makes
the dump of offsets comparable to other tools