greybus: module: remove obsolete gb_tty pointer

We aren't using this anymore, so remove gb_tty from struct gb_module.
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/module.c

@@ -132,8 +132,6 @@ void gb_module_destroy(struct gb_module *gmod)
 	list_del(&gmod->links);
 	spin_unlock_irq(&gb_modules_lock);
 
-	/* XXX Do something with gmod->gb_tty */
-
 	gb_interface_destroy(gmod);
 
 	kfree(gmod->product_string);

drivers/staging/greybus/module.h

@@ -28,8 +28,6 @@ struct gb_module {
 	u64 unique_id;
 
 	struct greybus_host_device *hd;
-
-	struct gb_tty *gb_tty;
 };
 #define to_gb_module(d) container_of(d, struct gb_module, dev)