Index: sys/dev/superio/superio.c
===================================================================
--- sys/dev/superio/superio.c
+++ sys/dev/superio/superio.c
@@ -415,6 +415,8 @@
 	case SUPERIO_DEV_MAX:
 		return ("invalid");
 	}
+	/* Required by old GCC */
+	return ("invalid");
 }
 
 static int