tty: make tty_set_operations an inline

Since commit f34d7a5 (tty: The big operations rework) in 2008,
tty_set_operations() is a simple one-line assignment. There is no reason
for this to be an exported function, hence move it to a header and make
an inline from that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210723074317.32690-7-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_io.c

@@ -3438,13 +3438,6 @@ void tty_driver_kref_put(struct tty_driver *driver)
 }
 EXPORT_SYMBOL(tty_driver_kref_put);
 
-void tty_set_operations(struct tty_driver *driver,
-			const struct tty_operations *op)
-{
-	driver->ops = op;
-};
-EXPORT_SYMBOL(tty_set_operations);
-
 void put_tty_driver(struct tty_driver *d)
 {
 	tty_driver_kref_put(d);

include/linux/tty_driver.h

@@ -330,8 +330,6 @@ extern struct list_head tty_drivers;
 extern struct tty_driver *__tty_alloc_driver(unsigned int lines,
 		struct module *owner, unsigned long flags);
 extern void put_tty_driver(struct tty_driver *driver);
-extern void tty_set_operations(struct tty_driver *driver,
-			const struct tty_operations *op);
 extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
 
 extern void tty_driver_kref_put(struct tty_driver *driver);
@@ -346,6 +344,12 @@ static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
 	return d;
 }
 
+static inline void tty_set_operations(struct tty_driver *driver,
+		const struct tty_operations *op)
+{
+	driver->ops = op;
+}
+
 /* tty driver magic number */
 #define TTY_DRIVER_MAGIC		0x5402