Libarchive recognizes hardlinked files on ISO images,

but returned them incorrectly, causing tar to actually
erase the resulting file while trying to restore the
link.  This one-line fix corrects the hardlink descriptions
to avoid this problem.

Thanks to Jung-uk Kim for pointing this out.

Approved by:	re (kib)

lib/libarchive/archive_read_support_format_iso9660.c

@@ -579,6 +579,7 @@ archive_read_format_iso9660_read_header(struct archive_read *a,
 	    && file->size > 0) {
 		archive_entry_set_hardlink(entry,
 		    iso9660->previous_pathname.s);
+		archive_entry_unset_size(entry);
 		iso9660->entry_bytes_remaining = 0;
 		iso9660->entry_sparse_offset = 0;
 		release_file(iso9660, file);