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/xsysace.c b/drivers/block/xsysace.c
index b20abe10..e5c5415 100644
--- a/drivers/block/xsysace.c
+++ b/drivers/block/xsysace.c
@@ -941,7 +941,7 @@
 	return 0;
 }
 
-static struct block_device_operations ace_fops = {
+static const struct block_device_operations ace_fops = {
 	.owner = THIS_MODULE,
 	.open = ace_open,
 	.release = ace_release,