memory corruption.
* grub-core/fs/iso9660.c (grub_fshelp_node): New field have_symlink.
Make symlink into an array.
(set_rockridge): Set have_symlink and alloc_dirents.
(grub_iso9660_read_symlink): Use new layout.
(grub_iso9660_iterate_dir): Fix memory corruption.
Use new layout.
(grub_iso9660_dir): Set have_symlink.
(grub_iso9660_open): Likewise.