cdrom: Remove unnecessary sanitize_format prototype

It's defined below without being called.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NJens Axboe <axboe@fb.com>

drivers/cdrom/cdrom.c

@@ -337,8 +337,6 @@ do {							\
 #define CDROM_DEF_TIMEOUT	(7 * HZ)
 
 /* Not-exported routines. */
-static void sanitize_format(union cdrom_addr *addr, 
-		u_char * curr, u_char requested);
 static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 		     unsigned long arg);