UBIFS: stop re-defining UBI operations

Now when we use UBIFS helpers for all the I/O, we can remove the horrible hack
of re-defining UBI I/O functions.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

fs/ubifs/debug.c

@@ -27,8 +27,6 @@
  * various local functions of those subsystems.
  */
 
-#define UBIFS_DBG_PRESERVE_UBI
-
 #include "ubifs.h"
 #include <linux/module.h>
 #include <linux/debugfs.h>

fs/ubifs/debug.h

@@ -305,13 +305,6 @@ int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
 int dbg_check_data_nodes_order(struct ubifs_info *c, struct list_head *head);
 int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head);
 
-#ifndef UBIFS_DBG_PRESERVE_UBI
-#define ubi_leb_write  dbg_leb_write
-#define ubi_leb_change dbg_leb_change
-#define ubi_leb_unmap  dbg_leb_unmap
-#define ubi_leb_map    dbg_leb_map
-#endif
-
 int dbg_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
 		  int offs, int len, int dtype);
 int dbg_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,