affs: bury unused macros

#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])

#define AFFS_BLOCK(sb, bh, blk)		(AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])

#ifdef __LITTLE_ENDIAN

#define BO_EXBITS	0x18UL

#elif defined(__BIG_ENDIAN)

#define BO_EXBITS	0x00UL

#else

#error Endianness must be known for affs to work.

#endif

#define AFFS_HEAD(bh)		((struct affs_head *)(bh)->b_data)

#define AFFS_TAIL(sb, bh)	((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))

#define AFFS_ROOT_HEAD(bh)	((struct affs_root_head *)(bh)->b_data)