fehlende Returns ergaenzt

Change-Id: Ic381d8c1ac60a57a45393577eca32b23a639eaa0
diff --git a/room/void.c b/room/void.c
index 061e62a..9a5f852 100644
--- a/room/void.c
+++ b/room/void.c
@@ -47,5 +47,6 @@
     if( (caller!=this_object() && !ARCH_SECURITY) || process_call() ) {
       return "Du darfst das Void nicht zerstoeren!\n";
     }
+    return 0;
 }