fix end-of-file detection

fix end-of-file detection
At the end of a nut file, the check for url_feof() fails because the
eof flag was cleared by the url_fseek() call that was used to skip over
the index packet.    This patch fixes this
patch by: Clemens Ladisch % cladisch A fastmail P net %
Original thread:
Date: Feb 27, 2007 6:13 PM
Subject: [Ffmpeg-devel] [PATCH] nutdec: fix end-of-file detection

Originally committed as revision 8447 to svn://svn.ffmpeg.org/ffmpeg/trunk