serial: constify serial_assign()

Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>

common/serial.c

@@ -149,7 +149,7 @@ void serial_stdio_init(void)
 	}
 }
 
-int serial_assign(char *name)
+int serial_assign(const char *name)
 {
 	struct serial_device *s;
 

include/serial.h

@@ -93,7 +93,7 @@ extern struct serial_device bfin_serial3_device;
 extern void serial_register(struct serial_device *);
 extern void serial_initialize(void);
 extern void serial_stdio_init(void);
-extern int serial_assign(char *name);
+extern int serial_assign(const char *name);
 extern void serial_reinit_all(void);
 
 /* For usbtty */