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/block/hd.c b/drivers/block/hd.c
index f9d0160..d5cdce0 100644
--- a/drivers/block/hd.c
+++ b/drivers/block/hd.c
@@ -692,7 +692,7 @@
 	return IRQ_HANDLED;
 }
 
-static struct block_device_operations hd_fops = {
+static const struct block_device_operations hd_fops = {
 	.getgeo =	hd_getgeo,
 };