cdrom: export cdrom_check_events()

It's used by sr, so we need to export it.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

drivers/cdrom/cdrom.c

@@ -1429,6 +1429,7 @@ unsigned int cdrom_check_events(struct cdrom_device_info *cdi,
 	cdi->vfs_events = 0;
 	return events;
 }
+EXPORT_SYMBOL(cdrom_check_events);
 
 /* We want to make media_changed accessible to the user through an
  * ioctl. The main problem now is that we must double-buffer the