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/ataflop.c b/drivers/block/ataflop.c
index 3ff0294..847a9e5 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -1856,7 +1856,7 @@
 	return 0;
 }
 
-static struct block_device_operations floppy_fops = {
+static const struct block_device_operations floppy_fops = {
 	.owner		= THIS_MODULE,
 	.open		= floppy_open,
 	.release	= floppy_release,