ntfs3: fix use-after-free of sbi->options in cmp_fnames

ntfs3: fix use-after-free of sbi->options in cmp_fnames

The root cause is that sbi->options points directly to fc->fs_private.
If fc->fs_private is freed while sbi still exists, sbi->options becomes
a dangling pointer.

This patch ensures that sbi->options is a separate copy of fc->fs_private
and duplicates nls_name if present. On superblock release or error,
sbi->options->nls_name and sbi->options are freed and sbi->options
is set to NULL to avoid any dangling pointer.

Reported-by: syzbot+d77c546c60db651a389c@syzkaller.appspotmail.com
Signed-off-by: YangWen <anmuxixixi@gmail.com>
[almaz.alexandrovich@paragon-software.com: remove syzbot logs from description]
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>