ALSA: line6: Remove superfluous NULL checks in each driver

The interface and driver objects are always set when callbacks are
called.  Drop such superfluous NULL checks in init and disconnect
calls of each driver.
Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/pod.c

@@ -401,25 +401,16 @@ static struct snd_kcontrol_new pod_control_monitor = {
 */
 static void line6_pod_disconnect(struct usb_interface *interface)
 {
-	struct usb_line6_pod *pod;
-
-	if (interface == NULL)
-		return;
-	pod = usb_get_intfdata(interface);
-
-	if (pod != NULL) {
-		struct device *dev = &interface->dev;
+	struct usb_line6_pod *pod = usb_get_intfdata(interface);
+	struct device *dev = &interface->dev;
 
-		if (dev != NULL) {
-			/* remove sysfs entries: */
-			device_remove_file(dev, &dev_attr_device_id);
-			device_remove_file(dev, &dev_attr_firmware_version);
-			device_remove_file(dev, &dev_attr_serial_number);
-		}
+	/* remove sysfs entries: */
+	device_remove_file(dev, &dev_attr_device_id);
+	device_remove_file(dev, &dev_attr_firmware_version);
+	device_remove_file(dev, &dev_attr_serial_number);
 
-		del_timer_sync(&pod->startup_timer);
-		cancel_work_sync(&pod->startup_work);
-	}
+	del_timer_sync(&pod->startup_timer);
+	cancel_work_sync(&pod->startup_work);
 }
 
 /*
@@ -456,9 +447,6 @@ static int pod_init(struct usb_interface *interface,
 	init_timer(&pod->startup_timer);
 	INIT_WORK(&pod->startup_work, pod_startup4);
 
-	if ((interface == NULL) || (pod == NULL))
-		return -ENODEV;
-
 	/* create sysfs entries: */
 	err = pod_create_files2(&interface->dev);
 	if (err < 0)

sound/usb/line6/podhd.c

@@ -90,12 +90,8 @@ static struct line6_pcm_properties podhd_pcm_properties = {
 static int podhd_init(struct usb_interface *interface,
 		      struct usb_line6 *line6)
 {
-	struct usb_line6_podhd *podhd = (struct usb_line6_podhd *) line6;
 	int err;
 
-	if ((interface == NULL) || (podhd == NULL))
-		return -ENODEV;
-
 	/* initialize MIDI subsystem: */
 	err = line6_init_midi(line6);
 	if (err < 0)

sound/usb/line6/toneport.c

@@ -370,9 +370,6 @@ static void line6_toneport_disconnect(struct usb_interface *interface)
 	struct usb_line6_toneport *toneport;
 	u16 idProduct;
 
-	if (interface == NULL)
-		return;
-
 	toneport = usb_get_intfdata(interface);
 	del_timer_sync(&toneport->timer);
 	idProduct = le16_to_cpu(toneport->line6.usbdev->descriptor.idProduct);
@@ -393,9 +390,6 @@ static int toneport_init(struct usb_interface *interface,
 	int err;
 	struct usb_line6_toneport *toneport =  (struct usb_line6_toneport *) line6;
 
-	if ((interface == NULL) || (toneport == NULL))
-		return -ENODEV;
-
 	line6->disconnect = line6_toneport_disconnect;
 
 	/* initialize PCM subsystem: */

sound/usb/line6/variax.c

@@ -214,12 +214,7 @@ static void line6_variax_disconnect(struct usb_interface *interface)
 {
 	struct usb_line6_variax *variax;
 
-	if (!interface)
-		return;
-
 	variax = usb_get_intfdata(interface);
-	if (!variax)
-		return;
 
 	del_timer(&variax->startup_timer1);
 	del_timer(&variax->startup_timer2);
@@ -244,9 +239,6 @@ static int variax_init(struct usb_interface *interface,
 	init_timer(&variax->startup_timer2);
 	INIT_WORK(&variax->startup_work, variax_startup6);
 
-	if ((interface == NULL) || (variax == NULL))
-		return -ENODEV;
-
 	/* initialize USB buffers: */
 	variax->buffer_activate = kmemdup(variax_activate,
 					  sizeof(variax_activate), GFP_KERNEL);