cdrom: remove unused variable

The clang static analyzer reports the following warning,

File: drivers/cdrom/cdrom.c
Warning: line 1380, column 7
	 Although the value stored to 'status' is used in enclosing
	 expression, the value is never actually read from 'status'

Remove the unused variable to eliminate the warning.
Signed-off-by: Enze Li <lienze@kylinos.cn>
Link: https://lore.kernel.org/all/20220401032623.293666-1-lienze@kylinos.cnSigned-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20220401211842.2088096-1-phil@philpotter.co.ukSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/cdrom/cdrom.c

@@ -1365,7 +1365,6 @@ static int cdrom_slot_status(struct cdrom_device_info *cdi, int slot)
  */
 int cdrom_number_of_slots(struct cdrom_device_info *cdi) 
 {
-	int status;
 	int nslots = 1;
 	struct cdrom_changer_info *info;
 
@@ -1377,7 +1376,7 @@ int cdrom_number_of_slots(struct cdrom_device_info *cdi)
 	if (!info)
 		return -ENOMEM;
 
-	if ((status = cdrom_read_mech_status(cdi, info)) == 0)
+	if (cdrom_read_mech_status(cdi, info) == 0)
 		nslots = info->hdr.nslots;
 
 	kfree(info);