char: constify tty_port_operations structs

Author: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com>

Constifies tty_port_operations structure in
the char driver since it is not modified
after its initialization.

Detected and found using Coccinelle.

Suggested-by: Julia Lawall 
Signed-off-by: Aya Mahfouz 
Acked-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

---
 drivers/char/ttyprintk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c
index a15ce4e..b098d2d 100644
--- a/drivers/char/ttyprintk.c
+++ b/drivers/char/ttyprintk.c
@@ -171,7 +171,7 @@ static const struct tty_operations ttyprintk_ops = {
 	.ioctl = tpk_ioctl,
 };
 
-static struct tty_port_operations null_ops = { };
+static const struct tty_port_operations null_ops = { };
 
 static struct tty_driver *ttyprintk_driver;

char: constify tty_port_operations structs

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