serial: st-asc: constify uart_ops structures

Check for uart_ops structures that are only stored in the ops field of a
uart_port structure.  This field is declared const, so uart_ops structures
that have this property can be declared as const also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct uart_ops i@p = { ... };

@ok@
identifier r.i;
struct uart_port e;
position p;
@@
e.ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct uart_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct uart_ops i = { ... };
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/st-asc.c

@@ -639,7 +639,7 @@ static void asc_put_poll_char(struct uart_port *port, unsigned char c)
 
 /*---------------------------------------------------------------------*/
 
-static struct uart_ops asc_uart_ops = {
+static const struct uart_ops asc_uart_ops = {
 	.tx_empty	= asc_tx_empty,
 	.set_mctrl	= asc_set_mctrl,
 	.get_mctrl	= asc_get_mctrl,