wrong filename if tarball entry is exactly 100 characters long

[josch]

steps to reproduce:

$ mkdir test
$ touch test/0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef01
$ tar -C test -cf test.tar .
$ ./genext2fs -B 1024 -N 17 -b 200 -a - -f -o Linux test.img < test.tar
$ sudo mount test.img /mnt
$ ls -lha /mnt
drwxr-xr-x  3 root  root  1.0K Jan  1  1970 .
drwxr-xr-x 25 root  root  4.0K Jun 12 16:28 ..
-rw-r--r--  1 josch josch    0 Jun 25 13:57 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef010000644
drwx------  2 root  root   16K Jan  1  1970 lost+found

As you can see, the filename has "0000644" appended at the end.

[bestouff]

Closed by #24