UBI: constify file operations

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index c183be9..d99935c 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -1025,20 +1025,20 @@
 }
 
 /* UBI control character device operations */
-struct file_operations ubi_ctrl_cdev_operations = {
+const struct file_operations ubi_ctrl_cdev_operations = {
 	.ioctl = ctrl_cdev_ioctl,
 	.owner = THIS_MODULE,
 };
 
 /* UBI character device operations */
-struct file_operations ubi_cdev_operations = {
+const struct file_operations ubi_cdev_operations = {
 	.owner = THIS_MODULE,
 	.ioctl = ubi_cdev_ioctl,
 	.llseek = no_llseek,
 };
 
 /* UBI volume character device operations */
-struct file_operations ubi_vol_cdev_operations = {
+const struct file_operations ubi_vol_cdev_operations = {
 	.owner   = THIS_MODULE,
 	.open    = vol_cdev_open,
 	.release = vol_cdev_release,