cdrom: export cdrom_check_events()

It's used by sr, so we need to export it.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 1ea8f8d..14033a3 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -1429,6 +1429,7 @@
 	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