fs/ntfs3: Fix oob in ntfs_listxattr

The length of name cannot exceed the space occupied by ea.

Reported-and-tested-by:  <syzbot+65e940cfb8f99a97aca7@syzkaller.appspotmail.com>
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>