ext3, ext4, ocfs2: remove unused macro NAMEI_RA_INDEX

This macro, initially introduced by ext2 in v0.99.15, does not
have any users from the beginning. It has been removed in later
ext2 version but still remains in the code of ext3, ext4, ocfs2.
Remove this macro there.

Cc: Jan Kara <jack@suse.cz>
Cc: linux-ext4@vger.kernel.org
Cc: ocfs2-devel@oss.oracle.com
Acked-by: NMark Fasheh <mfasheh@suse.de>
Acked-by: N"Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: NGuo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: NJan Kara <jack@suse.cz>

fs/ext3/namei.c

@@ -36,7 +36,6 @@
 #define NAMEI_RA_CHUNKS  2
 #define NAMEI_RA_BLOCKS  4
 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
-#define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
 
 static struct buffer_head *ext3_append(handle_t *handle,
 					struct inode *inode,

fs/ext4/namei.c

@@ -47,7 +47,6 @@
 #define NAMEI_RA_CHUNKS  2
 #define NAMEI_RA_BLOCKS  4
 #define NAMEI_RA_SIZE	     (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
-#define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
 
 static struct buffer_head *ext4_append(handle_t *handle,
 					struct inode *inode,

fs/ocfs2/dir.c

@@ -67,7 +67,6 @@
 #define NAMEI_RA_CHUNKS  2
 #define NAMEI_RA_BLOCKS  4
 #define NAMEI_RA_SIZE        (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
-#define NAMEI_RA_INDEX(c,b)  (((c) * NAMEI_RA_BLOCKS) + (b))
 
 static unsigned char ocfs2_filetype_table[] = {
 	DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK