[BUG] directory tree error (probably)

[Martin Brugnara]

It seams that "cd [/]{1,}" should take you to the root node. (as showed up
by 'ls')

But when we try with two "/" something goes wrong:
   ls works as to be in the root node,
   pwd report "//" as path instead of "/"
   the bash line report "//" as path too


How to reproduce:

user@pc:/home/user$ cd /
user@pc:/$ pwd
/
user@pc:/$ ls
bin   dev  home        lib    lost+found  mnt  proc  run   selinux  sys
 usr  vmlinuz
boot  etc  initrd.img  lib64  media   opt  root  sbin  srv     tmp  var

user@pc:/home/user$ cd //
user@pc://$ pwd
//
user@pc://$ ls
bin   dev  home        lib    lost+found  mnt  proc  run   selinux  sys
 usr  vmlinuz
boot  etc  initrd.img  lib64  media  opt  root  sbin  srv    tmp  var

user@pc:/home/user$ cd ///
user@pc:/$ pwd
/
user@pc:/$ ls
bin   dev  home        lib    lost+found  mnt  proc  run   selinux  sys
 usr  vmlinuz
boot  etc  initrd.img  lib64  media   opt  root  sbin  srv     tmp  var

Confirmed on:
- Debian 7
GNU bash, version 4.2.37(1)-release (x86_64-pc-linux-gnu)
- Fedora 19
GNU bash, version 4.2.45(1)-release (x86_64-redheat-linux-gnu)