ALSA: line6: Fix POD sysfs attributes segfault

BugLink: http://bugs.launchpad.net/bugs/1621113

commit b027d112 upstream.

The commit 02fc76f6 changed base of the sysfs attributes from device to card.
The "show" callbacks dereferenced wrong objects because of this.

Fixes: 02fc76f6 ('ALSA: line6: Create sysfs via snd_card_add_dev_attr()')
Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Andrej Krutak <dev@andree.sk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

sound/usb/line6/pod.c

@@ -244,8 +244,8 @@ static int pod_set_system_param_int(struct usb_line6_pod *pod, int value,
 static ssize_t serial_number_show(struct device *dev,
 				  struct device_attribute *attr, char *buf)
 {
-	struct usb_interface *interface = to_usb_interface(dev);
-	struct usb_line6_pod *pod = usb_get_intfdata(interface);
+	struct snd_card *card = dev_to_snd_card(dev);
+	struct usb_line6_pod *pod = card->private_data;
 
 	return sprintf(buf, "%u\n", pod->serial_number);
 }
@@ -256,8 +256,8 @@ static ssize_t serial_number_show(struct device *dev,
 static ssize_t firmware_version_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
-	struct usb_interface *interface = to_usb_interface(dev);
-	struct usb_line6_pod *pod = usb_get_intfdata(interface);
+	struct snd_card *card = dev_to_snd_card(dev);
+	struct usb_line6_pod *pod = card->private_data;
 
 	return sprintf(buf, "%d.%02d\n", pod->firmware_version / 100,
 		       pod->firmware_version % 100);
@@ -269,8 +269,8 @@ static ssize_t firmware_version_show(struct device *dev,
 static ssize_t device_id_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
-	struct usb_interface *interface = to_usb_interface(dev);
-	struct usb_line6_pod *pod = usb_get_intfdata(interface);
+	struct snd_card *card = dev_to_snd_card(dev);
+	struct usb_line6_pod *pod = card->private_data;
 
 	return sprintf(buf, "%d\n", pod->device_id);
 }