const: constify remaining file_operations

[akpm@linux-foundation.org: fix KVM]
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/bfin-otp.c b/drivers/char/bfin-otp.c
index e3dd24b..836d4f0 100644
--- a/drivers/char/bfin-otp.c
+++ b/drivers/char/bfin-otp.c
@@ -217,7 +217,7 @@
 # define bfin_otp_ioctl NULL
 #endif
 
-static struct file_operations bfin_otp_fops = {
+static const struct file_operations bfin_otp_fops = {
 	.owner          = THIS_MODULE,
 	.unlocked_ioctl = bfin_otp_ioctl,
 	.read           = bfin_otp_read,