stream_libarchive: fix hangs when demuxer does out of bound seeks

This happened with a .flac file inside an archive. It tried to seek
beyond the end of the archive entry in a format where seeking isn't
supported. stream_libarchive handles these situations by skipping data.
But when the end of the archive is reached, archive_read_data() returns
0. While libarchive didn't bother to fucking document this, they do say
it's supposed to work like read(), so I guess a return value of 0 really
means EOF. So change the "< 0" to "<= 0". Also add some error logging.

The same file actually worked without out of bounds reads when
extracted, so there still might be something very wrong.

0 files changed, 0 insertions, 0 deletions