[media] hide unused functions for !MEDIA_CONTROLLER

Some functions in the au0828 driver are only used when CONFIG_MEDIA_CONTROLLER
is enabled, and otherwise defined as empty functions:

media/usb/au0828/au0828-core.c:208:13: error: 'au0828_media_graph_notify' defined but not used [-Werror=unused-function]
media/usb/au0828/au0828-core.c:262:12: error: 'au0828_enable_source' defined but not used [-Werror=unused-function]
media/usb/au0828/au0828-core.c:412:13: error: 'au0828_disable_source' defined but not used [-Werror=unused-function]

This moves the #ifdef so the entire definitions are hidden in this case.

[mchehab@osg.samsung.com: As pointed by Shuah Khan, a return 0 can be removed]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/au0828/au0828-core.c

@@ -205,10 +205,10 @@ static int au0828_media_device_init(struct au0828_dev *dev,
 	return 0;
 }
 
+#ifdef CONFIG_MEDIA_CONTROLLER
 static void au0828_media_graph_notify(struct media_entity *new,
 				      void *notify_data)
 {
-#ifdef CONFIG_MEDIA_CONTROLLER
 	struct au0828_dev *dev = (struct au0828_dev *) notify_data;
 	int ret;
 	struct media_entity *entity, *mixer = NULL, *decoder = NULL;
@@ -256,13 +256,11 @@ static void au0828_media_graph_notify(struct media_entity *new,
 			dev_err(&dev->usbdev->dev,
 				"Mixer Pad Link Create Error: %d\n", ret);
 	}
-#endif
 }
 
 static int au0828_enable_source(struct media_entity *entity,
 				struct media_pipeline *pipe)
 {
-#ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_entity  *source, *find_source;
 	struct media_entity *sink;
 	struct media_link *link, *found_link = NULL;
@@ -405,13 +403,10 @@ static int au0828_enable_source(struct media_entity *entity,
 	pr_debug("au0828_enable_source() end %s %d %d\n",
 		 entity->name, entity->function, ret);
 	return ret;
-#endif
-	return 0;
 }
 
 static void au0828_disable_source(struct media_entity *entity)
 {
-#ifdef CONFIG_MEDIA_CONTROLLER
 	int ret = 0;
 	struct media_device *mdev = entity->graph_obj.mdev;
 	struct au0828_dev *dev;
@@ -453,8 +448,8 @@ static void au0828_disable_source(struct media_entity *entity)
 
 end:
 	mutex_unlock(&mdev->graph_mutex);
-#endif
 }
+#endif
 
 static int au0828_media_device_register(struct au0828_dev *dev,
 					struct usb_device *udev)