staging: exfat: Clean up return codes - remove unused codes

There are 6 FFS_* error values not used at all. Remove them.
Signed-off-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Link: https://lore.kernel.org/r/20191112021000.42091-7-Valdis.Kletnieks@vt.eduSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/exfat/exfat.h

@@ -210,12 +210,6 @@ static inline u16 get_row_index(u16 i)
 
 /* return values */
 #define FFS_SUCCESS             0
-#define FFS_MOUNTED             3
-#define FFS_NOTMOUNTED          4
-#define FFS_ALIGNMENTERR        5
-#define FFS_SEMAPHOREERR        6
-#define FFS_NOTOPENED           12
-#define FFS_MAXOPENED           13
 
 #define NUM_UPCASE              2918