ColdFire: Remove compiler warning messages

Remove unused variables and printf type mismatch in
lib_m68k/board.c

Signed-off-by: TsiChung Liew <tsicliew@gmail.com>

lib_m68k/board.c

@@ -535,7 +535,7 @@ void board_init_r (gd_t *id, ulong dest_addr)
 		 */
 		s = getenv ("flashchecksum");
 		if (s && (*s == 'y')) {
-			printf ("  CRC: %08lX",
+			printf ("  CRC: %08X",
 					crc32 (0,
 						   (const unsigned char *) CONFIG_SYS_FLASH_BASE,
 						   flash_size)