udev ALSA: don't be reliant on device node path, use kernel path

modules/services_discovery/udev.c

@@ -439,12 +439,13 @@ int OpenV4L (vlc_object_t *obj)
 static int alsa_get_device (struct udev_device *dev, unsigned *restrict pcard,
                             unsigned *restrict pdevice)
 {
-    const char *node = udev_device_get_devnode (dev);
+    const char *node = udev_device_get_devpath (dev);
     char type;
 
+    node = strrchr (node, '/');
     if (node == NULL)
         return -1;
-    if (sscanf (node, "/dev/snd/pcmC%uD%u%c", pcard, pdevice, &type) < 3)
+    if (sscanf (node, "/pcmC%uD%u%c", pcard, pdevice, &type) < 3)
         return -1;
     if (type != 'c')
         return -1;