Driver Core: sound: add nodename for sound drivers

This adds support to the sound core to report the proper device name to
userspace for their devices.

Signed-off-by: Kay Sievers <[e-mail]>
Signed-off-by: Jan Blunck <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

sound/sound_core.c

···
 MODULE_AUTHOR("Alan Cox");
 MODULE_LICENSE("GPL");
 
+static char *sound_nodename(struct device *dev)
+{
+	return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev));
+}
+
 static int __init init_soundcore(void)
 {
 	int rc;
···
 		cleanup_oss_soundcore();
 		return PTR_ERR(sound_class);
 	}
+
+	sound_class->nodename = sound_nodename;
 
 	return 0;
 }