ide-cd: kill CDROM_STATE_FLAGS() macro

While at it rename 'info' variable to 'cd' in cdrom_saw_media_change().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-cd.h

@@ -80,8 +80,6 @@ struct ide_cd_state_flags {
 	byte current_speed;	/* Current speed of the drive */
 };
 
-#define CDROM_STATE_FLAGS(drive) (&(((struct cdrom_info *)(drive->driver_data))->state_flags))
-
 /* Structure of a MSF cdrom address. */
 struct atapi_msf {
 	byte reserved;