UBIFS: remove a couple of unused macros

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

fs/ubifs/debug.h

@@ -331,9 +331,6 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c);
 		ubifs_err(fmt, ##__VA_ARGS__);     \
 } while (0)
 
-#define DBGKEY(key)  ((char *)(key))
-#define DBGKEY1(key) ((char *)(key))
-
 #define ubifs_dbg_msg(fmt, ...) do {                        \
 	if (0)                                              \
 		printk(KERN_DEBUG fmt "\n", ##__VA_ARGS__); \