[Toybox] dirtree_parentfd broken

[enh]

struct dirtree {
...
  int data;  // dirfd for directory, linklen for symlink

but:

int dirtree_parentfd(struct dirtree *node)
{
  return node->parent ? node->parent->data : AT_FDCWD;
}

this shows up in ls if you "ls -Z some-symlink", because of this:

      int fd = openat(dirtree_parentfd(new), new->name,
        O_PATH|(O_NOFOLLOW*!!(toys.optflags&FLAG_L)));

which means we end up trying to openat relative to an int that's the
length of the symlink target, not actually an fd.

-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.

 1447523132.0