const: make block_device_operations const

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index cce0fe4..eb61f7a 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -525,7 +525,7 @@
 	return cdrom_media_changed(&cd->cdi);
 }
 
-static struct block_device_operations sr_bdops =
+static const struct block_device_operations sr_bdops =
 {
 	.owner		= THIS_MODULE,
 	.open		= sr_block_open,